## Version 5.1.38 (2018-05-09)

This is a maintenance release. The following items were fixed and/or added:

- Linux hosts: support Linux 4.17 changes. Thank you Larry Finger

- Linux guests: support Linux 4.16 and EL 7.5 kernels (bugs #17676 and #17678)

- Linux guests: 3D fixes for recent guests (bug #17623)

## Version 5.1.36 (2018-04-17)

This is a maintenance release. The following items were fixed and/or added:

- VMM: Fixed missing NULL pointer check in MMIO code.

- Network: fixed VERR_INTNET_FLT_IF_NOT_FOUND when bridging to some adapters on Windows hosts (possibly related bugs #15294, #15060, #13481)

## Version 5.1.34 (2018-02-27)

This is a maintenance release. The following items were fixed and/or added:

- VMM: Added support for FSGSBASE, PCID, INVPCID CPU features for guests

- VMM: Fixed EMM386 issue with detecting suitable page frame base (bug #10022)

- Front end: switched to https downloads

- Serial: fixed an issue where the serial port parameters in the emulation and host serial port got out of sync (bug #17116)

- Storage: fixed handling VMDK images created by Amazon EC2 VM export

- Audio: various fixes for HDA emulation

- 3D: add environment variable to configure presenting 3D content on main thread (see bug #13653)

- Windows hosts: fixed indiscriminate binding of NDIS5 bridged driver, that caused PPPOE malfunction (bugs #16407, #17489)

- Linux guests: Linux 4.15 support (bugs #17311, #17320, #17282)

- Linux guests: fixed black screen when 3D enabled in guests (bug #17463, 5.2.6 regression)

- Linux guests: suppress setuid and setgid in shared folders

## Version 5.1.32 (2018-01-15)

This is a maintenance release. The following items were fixed and/or added:

- GUI: fixed occasional screen corruption when host screen resolution is changed

- User interface: increase proposed disk size when creating new VMs for Windows 7 and newer

- Serial: fixed broken communication with certain devices on Linux hosts

- VMM: Fixed problems using 256MB VRAM in raw-mode VMs

- Audio: added HDA support for more exotic guests (e.g. Haiku)

- Audio: fixed playback with ALSA backend (5.1.28 regression)

- USB/OHCI: fixed a problem where OHCI emulation might sporadically drop data transfers

- Windows hosts: VirtualBoxManager in the Python API no longer calls CoUninitialize when destroyed

- Linux hosts: fixed VBoxNetFlt kernel module compilation failure with Linux kernel 4.14

- Linux guests: fixed kernel module compilation and other problems with Linux kernel 4.14

## Version 5.1.30 (2017-10-16)

This is a maintenance release. The following items were fixed and/or added:

- GUI: translation updates

- GUI: fixed double mouse cursor when using mouse integration without Guest Additions, actually a Qt 5.6 bug fixed with QT 5.6.3 (Mac OS X hosts only; bug #15610)

- Solaris hosts: allow increasing MTU size for host-only adapter to 9706 bytes to support jumbo frames

- Linux hosts: glibc 2.26 compile fix

- Windows Additions: 3D related crash fix (bugs #17082, #17092)

## Version 5.1.28 (2017-09-13)

This is a maintenance release. The following items were fixed and/or added:

- GUI: mouse events did not reach host windows behind the transparent VM window (Mac OS X hosts only; bug #16246)

- Audio: fixed accidental crashes when using the AC'97 sound emulation (bug #16959)

- Audio: fixed crash when default input or output devices have changed (bugs #16968, #16969, #17004)

- Audio: fixed recording when using the ALSA backend

- Audio: fixed handle leak when using the OSS backend

- E1000: fixed a crash related to VLAN traffic over internal network (5.1.26 regression; bug #16960)

- NAT: apply --natbindip1 to TCP connections (bug #16478)

- OVF: when importing an appliance with XHCI controller, don't add an OHCI controller

- Mac OS X hosts: fixed a GUI crash if Spotlight is used from file dialogs (5.1.20 regression; bugs #16935, #16953)

- Linux hosts: fixed creating fixed sized VDI images (bug #17010)

- Linux hosts / guests: fixes for Linux 4.4 of openSUSE Leap 42.3 (bug #16966)

- Bridged networking: align outgoing packet at word boundary, preventing Windows host crash in MsLbfoProvider

- Linux Additions: kernel drm driver support for custom EL7 Linux 3.10 kernel

- Solaris Additions: hide an informational message on the bootup console

## Version 5.1.26 (2017-07-27)

This is a maintenance release. The following items were fixed and/or added:

- VMM: reset the TSC on VM reset to work around a Windows bug (bug #16643)

- Audio: fixed memory leak when enabled with VRDP connections (5.1.24 regression; bug #16928)

- Audio: fixed creation of too many sound sinks on Linux hosts when using the PulseAudio backend (bug #16938)

- Audio: implemented record gain registers for AC'97 emulation; those are needed for newer Ubuntu guests which rely on those when controlling gain and muting the recording (capturing) levels

- Storage: fixed hang when using the emulated NVMe controller with the SPDK (bug #16945)

- Mouse: double click was not working with a precision touchpad (bug #14632)

- Linux hosts: properly bring up host-only network interfaces with iproute (5.1.24 regression; bug #16911)

- Linux hosts: provide Python 3 libraries for deb/rpm packages

- Windows hosts: make it possible to use host-only networking without having bridged networking installed

- Windows guests: fixed automatic logons for Vista and newer Windows guests (5.1.24 regression; bug #16921)

## Version 5.1.24 (2017-07-18)

This is a maintenance release. The following items were fixed and/or added:

- VMM: mask the VME CPUID capability on AMD Ryzen processors for now to make certain guests works, for example Windows XP

- VMM: emulate more SSE2 instructions

- VMM: properly clear the TF and AC flags when dispatching real-mode interrupts

- GUI: fixes to make the mini-toolbar work with recent versions of KDE / Plasma (bug #16325)

- GUI: fixed a potential crash when a VM with multiple screens is running in full screen / seamless mode and a host screen is removed, for example when connecting to the host via RDP

- GUI: fixed initial size hints for guests which set intermediate sizes before responding (bug #16593)

- GUI: prevent stopped screen updates or black screen on reboot in a multi-screen setup under certain conditions

- Audio: many improvements for Windows 10 guests (bugs #15189, #15925, #16170, #16682, #16794 and others)

- Storage: fixed possible crash when using Intels SPDK

- API: use the correct file name of the VM machine state if the VM settings directory is renamed, for example during grouping / ungrouping a VM (bugs #16074 and #16745)

- API: return the correct error code if powering up a VM fails

- API: video recording did not automatically start at VM start when enabled in the VM settings (bug #16803)

- API: when relocating a medium, check that the target path is fully qualified

- EFI: fix for VMs with more than 3504MB RAM (bug #11103)

- Host-only adapter: correctly determine IPv4 netmasks on Windows hosts (bug #16826)

- NAT network: properly do the refcounting for starting / stopping the NAT / DHCP services if the NAT network is changed while the adapter network connection type is anything else but NAT network

- VBoxManage: fixed controlvm videocapfile (bug #16779)

- Windows hosts: another fix for Windows insider builds (bug #16892)

- Windows hosts: fixed crashes if driver verifier is enabled (bug #15741)

- Linux / Mac OS X hosts: more fixes for loading shared libraries (5.1.20 regression; bugs #16778, #16693)

- Linux hosts / guests: Linux 4.12 fixes (bugs #16725, #16800)

- Linux hosts / guests: reduce the kernel stack consumption for Linux kernels with CONFIG_CPUMASK_OFFSTACK defined

- Linux hosts / guests: fixes for kernel modules built with gcc-7 (bug #16772)

- Linux hosts / guests: Linux 4.13 fix (bug #16887)

- Linux hosts: don't depend on net-tools on newer distributions as this package is deprecated in favour of iproute (bug #16764)

- Linux hosts: make 2D video acceleration available for older Linux distributions (5.1 regression; bug #16858)

- Linux Additions: fix for dynamic resizing with Oracle Linux 6 with UEK4

- Linux Additions: make Fedora 25 and 26 Alpha work when 3D pass-through is enabled

- Linux Additions: no longer recommend removing distribution- installed Additions if they are updated to our guidelines

## Version 5.1.22 (2017-04-28)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed VERR_IEM_INSTR_NOT_IMPLEMENTED Guru Meditation under certain conditions (5.1 regression; mostly Mac OS X hosts; bugs #15693, #15801, #16274, #16569, #16663)

- VMM: fixed software virtualization on Solaris hosts (5.1.20 regression)

- Storage: fixed a potential hang under rare circumstances (bug #16677)

- Storage: fixed a potential crash under rare circumstances (asynchronous I/O disabled or during maintenance file operations like merging snapshots)

- Linux hosts: make the ALSA backend work again as well as loading the GL libraries on certain hosts (5.1.20 regression; bugs #16667, #16693)

- Linux Additions: fixed mount.vboxsf symlink problem (5.1.20 regression; bug #16670)

## Version 5.1.20 (2017-04-18)

This is a maintenance release. The following items were fixed and/or added:

- GUI: don't check if the Extension Pack is up-to-date if the user is about to install a new Extension Pack (bug #16317)

- GUI: fixed a possible crash when switching a multi-monitor VM into full-screen or seamless mode

- GUI: fixed non-literal shortcuts if the keyboard is not captured (5.1.10 regression; Windows hosts only)

- GUI: several mini-toolbar fixes in full-screen / seamless mode (X11 hosts only)

- GUI: don't crash on restoring defaults in the appliance import dialog

- Windows Additions: another fix for automatic logins for Windows Vista and newer (bug #15904)

- ICH9: fix for Windows guests with a huge amount (>64G) of guest memory

- BIOS: fixed El Torito hard disk emulation geometry calculation (thanks Dwight Engen)

## Version 5.1.18 (2017-03-15)

This is a maintenance release. The following items were fixed and/or added:

- Shared Folders: fixed case insensitive filename access (5.1.16 regression; Windows guests only; bug #16549)

- Shared Folders: fixed access to long pathes (5.1.16 regression; Windows guests only; bugs #14651, #16564)

- API: fixed snapshot handling of medium attachments and PCI device attachments (bug #16545)

- API: make 32-bit Windows guests boot again with software virtualization if the ICH9 chipset is used (5.1.16 regression)

- VBoxBugReport: fixed VM log collection issue

- Linux hosts: fixed autostart service script (bug #14955)

- Windows Additions: fixed automatic logins for Windows Vista and newer (5.1.4 regression; bug #15904)

## Version 5.1.16 (2017-03-08)

This is a maintenance release. The following items were fixed and/or added:

- VMM: don't access the MSR_IA32_SMM_MONITOR_CTL MSR if dual-monitor treatment is not available (KVM workaround, bug #14965)

- VMM: another fix for handling certain MSRs on ancient CPUs without VT-x support for MSR bitmaps

- VMM: fixed VERR_SSM_LOAD_CPUID_MISMATCH errors when restoring a saved state with SMP guests on hosts without the CPUID/HTT bit set (bug #16428)

- VMM: fixed a bug in call gate emulation

- VMM: FWAIT instruction fix

- VMM: fixed a sporadic guest hang under certain conditions

- GUI: hide the mini-toolbar from the taskbar and the pager on certain X11 hosts

- GUI: better error handling on the global settings / network / host-only / DHCP server settings

- GUI: fixes for full-screen with multiple screens

- Host-only Network: fixed host-only adapter creation issue preventing VirtualBox installation on Windows 10 hosts (bug #16379)

- NAT network: fixed two potential crashes in the DHCP server

- ICH9: fixed incorrect initialization of the primary bus for PCI bridges (5.1.14 regression)

- Storage: LsiLogic fix for Windows 10

- USB: fixed not being able to attach certain USB devices having invalid characters in the device strings (5.0.18 regression; bug #15956)

- USB: several fixes for the USB/IP support (bug #16462)

- VBoxSVC: fixed another crash during shutdown under rare circumstances

- VBoxSVC: fixed a stack overflow on (Windows debug builds only; bug #16409)

- OVF: when importing an appliance handle more than 10 network adapters if the OVA was created by VirtualBox (bug #16401)

- OVF: fixes for exporting and importing appliances with many disks (bug #16402)

- VBoxManage: fixed regression with modifyhd --resize (bug #16311)

- rdesktop-vrdp: source code tarball fixes

- Linux Installers: do not rebuild kernel modules unnecessarily (bug #16408)

- Linux hosts: added an action for opening the VM manager window to the .desktop file

- Linux hosts / guests: Linux 4.11 compile fixes (bug #16506)

- Linux Additions: added vboxsf FS modules alias (bug #16404)

- Linux Additions: fix for the shared folders kernel module to compile on Linux 4.10

- Linux Additions: properly install the Linux kernel module override rule on distributions without /etc/depmod.d

- Windows Additions: fixed a crash with recent Windows 10 builds if 3D is disabled (bug #15973)

## Version 5.1.14 (2017-01-16)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed emulation of certain instructions for 64-bit guests on 32-bit hosts

- VMM: properly handle certain MSRs for 64-bit guests on ancient CPUs without VT-x support for MSR bitmaps (bug #13886)

- GUI: fixed a crash with multimonitor setups under certain conditions

- GUI: allow cloning of snapshots when the VM is running

- NVMe: fixed compatibility with the Storage Performance Development Kit (SPDK, bug #16368)

- VBoxSVC: fixed a crash under rare circumstances

- VBoxManage: added a sanity check to modifymedium --resize to prevent users from resizing their hard disk from 1GB to 1PB (bug #16311)

- Windows hosts: another fix for recent Windows 10 hosts

- Linux hosts: Linux 4.10 fixes

- Linux Additions: fixed protocol error during certain operations on shared folders (bug #8463)

## Version 5.1.12 (2016-12-20)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed VERR_IEM_ASPECT_NOT_IMPLEMENTED Guru Meditations with certain Linux guests if KVM paravirtualization is enabled (5.1 regression; bugs #15613 and #16251)

- VMM: fixed VERR_VMX_UNABLE_TO_START_VM Guru Meditations under rare conditions

- GUI: prevent a crash under certain conditions if the VM is terminated very early

- GUI: fixed certain keyboard capture issues (5.1.10 regression; Mac OS X hosts only; bug #16150)

- GUI: fixed dragging guest windows in seamless mode with the keyboard captured (X11 hosts only; bug #15837)

- GUI: fixed a problem where the new version detected dialog was covered by the appliance import dialog (Mac OS X hosts only; bug #16238)

- Storage: fixed NVMe reset processing when doing rmmod nvme; modprobe nvme in a Linux guest (bug #16080)

- Storage: fixed creating a snapshot when the VM is running and an NVMe controller is present

- Storage: fixed a problem with the LsiLogic SCSI controller where requests could be lost with SMP guests

- E1000: fixed "cable disconnected" issue (Mac OS X guests only; 5.1.10 regression; bug #16260)

- E1000: fixed "TX unit hang" issue (Linux guests only; 5.1.10 regression; bug #16221)

- Parallel ports: fixed port enumeration on Windows host (bugs #15872 and #16127)

- API: don't crash when sanitizing certain VM names (bug #16299)

- Linux hosts: automatically disable asynchronous I/O on Linux 2.6.18 kernels as high I/O load may trigger kernel oopses on these kernels if this feature is enabled

- Linux hosts / guests: Linux 2.6.28 compile fix (bug #16267)

- Linux hosts: compile Linux 4.9 compile fix (bug #16286)

- Linux Additions: warn the user about a known bug with older Linux guests (e.g. Debian 7) requiring manual work to get 3D working (bug #15319)

- Linux Additions: fix the graphics driver build with Linux 4.10 and later (bug #16298)

- Windows Additions: fixed a crash in the WDDM driver under certain conditions

## Version 5.1.10 (2016-11-21)

This is a maintenance release. The following items were fixed and/or added:

- GUI: the USB filter settings dialog should allow to specify the USB revision in hexadecimal format (bug #15400)

- GUI: fixed crash on certain hosts when pressing certain key combinations (Windows hosts only; bug #15719)

- GUI: fixed issue with updating the available-geometry on host-screen work-area resize

- GUI: don't crash / hang on certain environments if accessibility support is enabled

- GUI: fixed various issues in Unscaled HiDPI Output mode (bug #15707)

- GUI: extend the VM Input menu with Print Screen-related actions

- GUI: improved handling of inserting the Guest Additions ISO image by trying all available optical drives rather than only the first one and by not asking the user if he wants to force unmounting (which doesn't work in most cases anyway)

- API: default to RTC using UTC for Solaris 11 guests

- Settings: be less restrictive when reading a VM configuration containing a host-only adapter without an interface name

- Storage: fixed resizing VDI images resulting in an unbootable image under certain circumstances (bug #15983)

- NAT: fixed several 5.1.8 regressions on Mac OS X and Windows hosts (bug #16084)

- Audio: fixed a few 5.1.x regressions by using the audio code from 5.0.x until the audio overhaul is completed

- VBoxManage: fixed documentation of the storagectl command (bug #15971)

- Build system: another fix for building VirtualBox on systems which default to Python 3

- Windows hosts: hardening fix for Windows 10 build 14971 (bug #16202)

- Windows Additions: properly start the VirtualBox guest services even if the guest user name contains special characters (bug #15982)

- Solaris Additions: fixed preemptible mouse notification callback being executed under a spinlock for Solaris guests

- Linux hosts / guests: Linux 4.9 fixes (bugs #16155 and #16064)

- Linux Additions: fixed Linux kernel module override rule (thanks Mark Furneaux)

## Version 5.1.8 (2016-10-18)

This is a maintenance release. The following items were fixed and/or added:

- GUI: fixed keyboard shortcut handling regressions (Mac OS X hosts only; bugs #15937 and #15938)

- GUI: fixed keyboard handling regression for separate UI (Windows hosts only; bugs #15928)

- NAT: don't exceed the maximum number of "search" suffixes. Patch from bug #15948

- NAT: fixed parsing of port-forwarding rules with a name which contains a slash (bug #16002)

- NAT Network: when the host has only loopback nameserver that cannot be mapped to the guests (e.g. dnsmasq running on 127.0.1.1), make DHCP supply NAT Network DNS proxy as nameserver

- Bridged Network: prevent flooding syslog with packet allocation error messages (bug #15569)

- Audio: now using Audio Queues on Mac OS X hosts

- Audio: fixed recording with the PulseAudio backend (5.1 regression)

- Audio: various bugfixes

- Snapshots: fixed regression in 5.1.4 for deleting snapshots with several disks (bug #15831)

- Snapshots: crash fix and better error reporting when snapshot deletion failed

- Storage: some fixes for the NVMe emulation with Windows guests

- API: fixed initialization of SAS controllers (bug #15972)

- Build system: make it possible to build VBox on systems which default to Python 3

- Windows hosts: detect certain cases of REGDB_E_CLASSNOTREG errors and print a helpful error message

- Windows hosts: adapted to changes in Windows 10 build 14901 (bug #15944)

- Windows hosts: better support for processor groups on Windows 7 and later which is required on certain hosts with many CPUs

- Windows installer / Additions: added option to prevent creating of start menu items (bug #15922)

- Windows Additions / VGA: if the guest's power management turns a virtual screen off, blank the corresponding VM window rather than hide the window

- Windows Additions: fixed a generic bug which could lead to freezing shared folders (bug #15662)

- Linux hosts / guests: fix for kernels with CONFIG_CPUMASK_OFFSTACK set (bug #16020)

- Linux Additions: don't require all virtual consoles be in text mode. This should fix cases when the guest is booted with a graphical boot screen (bug #15683)

- Linux Additions: added depmod overrides for the vboxguest and vboxsf kernel modules to fix conflicts with modules shipped by certain Linux distributions

- X11 Additions: disable 3D on the guest if the host does not provide enough capabilities (bug #15860)

## Version 5.1.6 (2016-09-12)

This is a maintenance release. The following items were fixed and/or added:

- GUI: fixed issue with opening '.vbox' files and it's aliases

- GUI: keyboard grabbing fixes (bugs #15771 and #15745)

- GUI: fix for passing through Ctrl + mouse-click (Mac OS X hosts only; bug #15714)

- GUI: fixed automatic deletion of extension pack files (bugs #11352 and #14742)

- USB: fixed showing unknown device instead of the manufacturer or product description under certain circumstances (5.1.0 regression; bug #15764)

- XHCI: another fix for a hanging guest under certain conditions as result of the fix for bug #15747, this time for Windows 7 guests

- Serial: fixed high CPU usage with certain USB to serial converters on Linux hosts (bug #7796)

- Storage: fixed attaching stream optimized VMDK images (bug #14764)

- Storage: reject image variants which are unsupported by the backend (bug #7227)

- Storage: fixed loading saved states created with VirtualBox 5.0.10 and older when using a SCSI controller (bug #15865)

- Storage: fixed broken NVMe emulation if the host I/O cache setting is enabled

- Storage: fixed using multiple NVMe controllers if ICH9 is used

- NVMe: fixed a crash during reset which could happen under certain circumstances

- Audio: fixed microphone input (5.1.2 regression; bugs #14386 and #15802)

- Audio: fixed crashes under certain conditions (5.1.0 regression; bug #15887 and others)

- Audio: fixed recording with the ALSA backend (5.1 regression)

- Audio: fixed stream access mode with OSS backend (5.1 regression, thanks to Jung-uk Kim)

- E1000: do also return masked bits when reading the ICR register, this fixes booting from iPXE (5.1.2 regression; bug #15846)

- BIOS: fixed 4bpp scanline calculation (bug #15787)

- API: relax the check for the version attribute in OVF/OVA appliances (bug #15856)

- Windows hosts: fixed crashes when terminating the VM selector or other VBox COM clients (bug #15726 and others)

- Linux Installer: fixed path to the documentation in .rpm packages (5.1.0 regression)

- Linux Installer: fixed the vboxdrv.sh script to prevent an SELinux complaint (bug #15816)

- Linux hosts: don't use 32-bit legacy capabilities

- Linux Additions: Linux 4.8 fix for the kernel display driver (bugs #15890 and #15896)

- Linux Additions: don't load the kernel modules provided by the Linux distribution but load the kernel modules from the official Guest Additions package instead (bug #15324)

- Linux Additions: fix dynamic resizing problems in recent Linux guests (bug #15875)

- User Manual: fixed error in the VBoxManage chapter for the getextradata enumerate example (bug #15862)

## Version 5.1.4 (2016-08-16)

This is a maintenance release. The following items were fixed and/or added:

- GUI: show actual VM uptime in the session information window

- Audio: re-enabled speakers for Mac OS X guests (5.1.0 regression; bug #15611)

- Audio: fixed crashes under certain conditions

- USB: fixed a hang under certain conditions

- USB: fixed a hanging guest under certain conditions (bug #15747)

- PIIX4: implemented dummy SMBus controller to prevent annoying Linux kernel warnings about uninitialized SMBus base address (bug #9517)

- NVMe: several fixes to improve stability, fixed a crash while saving a VM state

- VMDK: fixed an issue creating fixed size images with certain sizes and the Split2G option enabled (bug #15748)

- VHDX: fixed cloning images with VBoxManage clonehd (bug #14288)

- Storage: fixed broken bandwidth limitation when the limit is very low (bug #14982)

- EFI: fixed sending debug messages in the EFI firmware if a serial port is enabled (bug #12161)

- OVF: when importing appliances, make sure that the version of the embedded VirtualBox specific settings is processed, to get the default settings handling right

- VBoxManage: Don't try to set the medium type if there is no change (bug #13850)

- Linux installer: fixed some scripting issues (bugs #15701 and #15702)

- Linux installer: fixed a path issue on certain Linux distributions (bug #15717)

- Windows hosts: fixed corrupted mouse pointers with some Linux and Solaris guests (bug #15665)

- Linux Additions: made the video driver work on 32-bit guests with large video memory sizes (bug #15621)

- Linux Additions: made the video driver work on kernel 4.7 and later (bug #15769)

- Linux Additions: converted a failure message to an informational one when drivers could not be stopped during upgrade (bug #15692)

- Linux Additions: made the video driver work around an X server bug which cause screen refresh to stop (bug #15511)

- Windows Additions: auto-resizing fixes for Windows 10 guests (bug #15257)

- Windows Additions: fixed VBoxTray problems with Windows 2000 (bug #15661)

## Version 5.1.2 (2016-07-21)

This is a maintenance release. The following items were fixed and/or added:

- VMM: several fixes

- GUI: fixed screenshot if the VM is started in separate mode

- GUI: fixed issue with double-click/opening registered file types (.vbox and .vbox-extpack) on Mac OS X (bug #15648)

- GUI: fixed a bug which made it impossible close some error/warning messages using the close button

- GUI: weakened the control over the VM window behavior allowing to resize it across multiple screens and to use in Snap Assist techniques

- GUI: jump to the second tab of the session information window (5.1.0 regression)

- GUI: fix for Alt-Tab

- Storage: fixed creating fixed size VHD images (bug #15601)

- Storage: fixed a hang during power off if the VM was suspended before and a NVMe controller is configured

- USB: fixed a crash under certain conditions

- Audio: make AC'97 volume control work again (5.1.0 regression; bug #15598)

- Audio: fixed rare VM hangs when using AC'97 emulation

- Audio: SB16 fixes

- EFI: fixed access to devices attached to SATA port 2 and higher (bug #15607)

- OVA: fix for checking certain signatures

- OVA: fixed MAC address generation for appliances created by VirtualBox (5.1.0 regression; bug #15623)

- API: fixed audio settings handling for older config files (bug #15626)

- API: fixed truncation of USB product/vendor IDs on Linux hosts (5.1.0 regression; bug #15644)

- API: fixed VRDP with authentication (bug #15653)

- API: don't crash if there is no graphics controller configured (bug #15628)

- Linux hosts: fixed EL5 builds (bug #15634)

- non-Windows hosts: fixed a crash during shutdown under rare circumstances (bug #15568)

- Linux Additions: fixed SELinux issue which prevented certain Linux guests to work in 3D mode (bug #15574)

- User Manual: updates

## Version 5.1.0 (2016-07-12)

This is a major update. The following major new features were added:

- VMM: new APIC and I/O APIC implementations that result in significantly improved performance in certain situations (for example with networking, bug #15295)

- VMM: added support for Hyper-V paravirtualized debugging of Windows guests

- VMM: emulate even more MMIO and shadow pagetable exits without going back to user mode

- GUI: overall migration to Qt5 (bug #11775)

- GUI: passive API event listener improving the VM GUI performance and response time

- Audio: added HDA (High Definition Audio) support for newer Linux guests

- Audio: added on-demand timers which should improve the overall performance and reduce the CPU consumption

- Audio: more fine-grained volume control for the AC'97 emulation, which now also takes the master volume control into account

- better support for Python 3

In addition, the following items were fixed and/or added:

- VMM: activate the x2APIC by default for Linux guests

- VMM: many more fixes

- GUI: the Detach UI action is now a part of the VM Machine menu

- GUI: reworked session information window

- GUI: the new VM wizard now allows to choose the VM location for the VM which is being created

- GUI: fixed location of touch events in unscaled HiDPI mode (bugs #14366, #14367)

- GUI: various bugfixes and internal cleanup

- Storage: use fallocate() or similar if present to speed up creating fixed-sized disk images (bug #5967)

- Storage: implemented NVMHCI-compatible storage controller

- Audio: various bugfixes and infrastructure improvements

- E1000: implemented interrupt throttling for performance improvements

- EFI: many improvements, for example allow to boot from USB

- OVF: improved handling of signed manifests

- API: Windows XP guests and Windows 2003 server guests now default to the E1000 T Server network card

- VBoxSVC: fixed several memory leaks when handling .dmg images

- Installers: ship VBoxBugReport

- Windows hosts: reworked COM proxy (e.g. bug #8298)

- Linux installers: no longer rely on DKMS for module rebuilding

- Linux Additions: fix a problem when updating the initramfs after the guest modules are compiled (bug #15579)

- Linux Additions: try to fix a problem where the OpenGL libraries where loaded by the X server when we only support X clients (bug #15574)

## Version 5.0.24 (2016-06-28)

This is a maintenance release. The following items were fixed and/or added:

- VMM: reverted to the old I/O-APIC code for now to fix certain regressions with 5.0.22 (bug #15529). This means that the networking performance with certain guests will drop to the 5.0.20 level (bug #15295). One workaround is to disable GRO for Linux guests

- Main: when taking a screenshot, don't save garbage for blanked screens

- NAT: correctly parse resolv.conf file with multiple separators (5.0.22 regression)

- Storage: fixed a possible corruption of stream optimized VMDK images from VMware when opened in read/write mode for the first time

- ACPI: notify the guest when the battery / AC state changes instead of relying on guest polling

- Linux hosts: fixed VERR_VMM_SET_JMP_ABORTED_RESUME Guru Meditations on hosts with Linux 4.6 or later (bug #15439)

- Solaris hosts: make the GUI work on Solaris 10 again (bug #15549)

## Version 5.0.22 (2016-06-16)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixes for certain Intel Atom hosts (bug #14915)

- VMM: properly restore the complete FPU state for 32-bit guests on 64-bit hosts on Intel Sandy Bridge and Ivy Bridge CPUs

- VMM: new I/O-APIC implementation fixing several bugs and improving the performance under certain conditions (bug #15295 and others)

- VMM: fixed a potential Linux guest panic on AMD hosts

- VMM: fixed a potential hang with 32-bit EFI guests on Intel CPUs (VT-x without unrestricted guest execution)

- GUI: don't allow to start subsequent separate VM instances

- GUI: raised upper limit for video capture screen resolution (bug #15432)

- GUI: warn if the VM has less than 128MB VRAM configured and 3D enabled

- Main: when monitoring DNS configuration changes on Windows hosts avoid false positives from competing DHCP renewals. This should fix NAT link flaps when host has multiple DHCP configured interfaces, in particular when the host uses OpnVPN

- Main: properly display an error message if the VRDE server cannot be enabled at runtime, for example because another service is using the same port

- NAT: Initialize guest address guess for wildcard port-forwarding rules with default guest address (bug #15412)

- VGA: fix for a problem which made certain legacy guests crash under certain conditions (bug #14811)

- OVF: fixed import problems for some appliances using an AHCI controller created by 3rd party applications

- SDK: reduced memory usage in the webservice Java bindings

- Windows hosts: fixed performance regresson with SMP guests (5.0 regression)

- Windows hosts: fixes for the shared clipboard

- Windows hosts: Windows hardening fix

- Windows Additions: fixes to retain the guest display layout when resizing or disabling the guest monitors

- Linux hosts: EL 6.8 fix (bug #15411)

- Linux hosts: Linux 4.7 fix (bug #15459)

- Linux Additions: Linux 4.7 fixes (bug #15444)

- Linux Additions: fix for certain 32-bit guests (5.0.18 regression; bug #15320)

- Linux Additions: fixed mouse pointer offset (5.0.18 regression; bug #15324)

- Linux Additions: made old X.Org releases work again with kernels 3.11 and later (5.0.18 regression; bug #15319)

- Linux Additions: fixed X.Org crash after hard guest reset (5.0.18 regression; bug #15354)

- Linux Additions: don't stop the X11 setup if loading the shared folders module fails (5.0.18 regression)

- Linux Additions: don't complain if the Drag and Drop service is not available on the host

- Solaris Additions: added support for X.org 1.18

## Version 5.0.20 (2016-04-28)

This is a maintenance release. The following items were fixed and/or added:

- Storage: fixed a regression causing write requests from the BIOS to cause a Guru Meditation with the LsiLogic SCSI controller (5.0.18 regression; bug #15317)

- Storage: several emulation fixes in the BusLogic SCSI controller emulation

- NAT Network: support TCP in DNS proxy (same problem as in bug #14736 for NAT)

- NAT: rework handling of port-forwarding rules (bug #13570)

- NAT: rewrite host resolver to handle more query types and make it asynchronous so that a stalled lookup doesn't block all NAT traffic

- Snapshots: don't crash when restoring a snapshot which has more network adapters than the current state (ie when the snapshot uses ICH9 and the current state uses PIIX3)

- Guest Control: various bugfixes for the copyfrom and copyto commands / API (bug #14336)

- VBoxManage: list processor features on list hostinfo (bug #15334)

- Linux hosts: fix for Linux 4.5 if CONFIG_NET_CLS_ACT is enabled (bug #15327)

- Windows hosts: another fix for recent Windows 10 insider builds (bug #15337)

- Windows hosts: make it work on Windows XP again (5.0.18 regression)

- Windows Additions: fixed performance issues with PowerPoint 2010 and the WDDM graphics drivers if Aero is disabled

## Version 5.0.18 (2016-04-18)

This is a maintenance release. The following items were fixed and/or added:

- GUI: position off-screen windows to be fully visible again on relaunch in consistence with default-behavior (bug #15226)

- GUI: fixed the View menu / Full-screen Mode behavior on Mac OS X El Capitan

- GUI: fixed a test which allowed to encrypt a hard disk with an empty password

- GUI: fixed a crash under certain conditions during VM shutdown

- GUI: fixed the size of the VM list scrollbar in the VM selector when entering a group

- PC speaker passthrough: fixes (Linux hosts only; bug #627)

- Drag and drop: several fixes

- SATA: fixed hotplug flag handling when EFI is used

- Storage: fixed handling of encrypted disk images with SCSI controllers (bug #14812)

- Storage: fixed possible crash with Solaris 7 if the BusLogic SCSI controller is used

- USB: properly purge non-ASCII characters from USB strings (bugs #8801, #15222)

- NAT Network: fixed 100% CPU load in VBoxNetNAT on Mac OS X under certain circumstances (bug #15223)

- ACPI: fixed ACPI tables to make the display color management settings available again for older Windows versions (4.3.22 regression)

- Guest Control: fixed VBoxManage copyfrom command (bug #14336)

- Snapshots: fixed several problems when removing older snapshots (bug #15206)

- VBoxManage: fixed --verbose output of the guestcontrol command

- Windows hosts: hardening fixes required for recent Windows 10 insider builds (bugs #15245, #15296)

- Windows hosts: fixed support of jumbo frames in with bridged networking (5.0.16 regression; bug #15209)

- Windows hosts: don't prevent receiving multicast traffic if host-only adapters are installed (bug #8698)

- Linux hosts: added support for the new naming scheme of NVME disks when creating raw disks

- Solaris hosts / guests: properly sign the kernel modules (bug #12608)

- Linux hosts / guests: Linux 4.5 fixes (bug #15251)

- Linux hosts / guests: Linux 4.6 fixes (bug #15298)

- Linux Additions: added a kernel graphics driver to support graphics when X.Org does not have root rights (bug #14732)

- Linux/Solaris Additions: fixed several issues causing Linux/Solatis guests using software rendering when 3D acceleration is available

- Windows Additions: fixed a hang with PowerPoint 2010 and the WDDM drivers if Aero is disabled

## Version 5.0.16 (2016-03-04)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed a problem which could lead to a wrong guest behavior on AMD CPUs (bugs #14831 and #15186)

- GUI: don't try to synchronize the HID LEDs if the VM window is not active or if it's minimized (Windows / Mac OS X hosts only; bug #14302)

- GUI: prevent a crash during startup under rare conditions

- GUI: sub-menu option to disable the guest-OS type overlay in the application dock icon on Mac OS X

- GUI: position off-screen windows to be fully visible again on relaunch

- GUI: hide the VT-x/AMD-V checkbox if raw-mode is not supported (usually Mac OS X hosts; bug #15178)

- PC speaker passthrough: new experimental feature, available on Linux host only

- Audio: several fixes for Mac OS X hosts + guests

- Audio: properly handle default audio device changes (Windows hosts)

- USB: serveral fixes for the xHCI controller (e.g. for webcam passthrough)

- BIOS: fixed int15/AH=83/AL=00 function (4.2.0 regression)

- iPXE: enable the HTTP download protocol on non-Linux hosts (bug #13628)

- Shared folders: fixed a failure to load the saved state under certain circumstances (bug #6314)

- Guest Control: added support for (cached) Active Directory authentication in case the domain controller is not reachable (anymore)

- Serial ports: raised the number of serial ports per VM from 2 to 4 (bug #9109)

- Serial ports: fix for the TCP/IP backend (Windows hosts only; bug #15188)

- SDK: make the Python webservice API binding work again (5.0 regression)

- Seamless mode: fixed a crash under certain circumstances (bug #15106)

- Linux hosts: fixed the /sbin/rcvboxdrv script as well as the missing shebang in two scripts (bugs #15055 and #15057)

- Linux hosts: properly uninstall Python files installed by the .run installer

- Windows hosts: hardening fix required for recent Windows insider builds (bug #14052)

- Windows hosts: fixed Python installation path (bug #13131)

- Windows hosts: support MTU larger than 2 KB with bridged networking (bug #15140)

- Windows hosts / guests: properly sign binaries using a sha-256 certificate (bug #15054)

- Windows Additions: fixed guest property enumeration of logged-in users

- Windows Additions: fixed sporadical failure of the graphics driver in Windows 10 guests (bug #14409)

- Windows Additions: under rare circumstances no mouse movement events were delivered to the guest

## Version 5.0.14 (2016-01-19)

This is a maintenance release. The following items were fixed and/or added:

- GUI: properly limit the number of VCPUs to the number of physical cores on Mac OS X (bug #15018)

- Audio: fixed a bug which prevented loading a saved state of a saved guests with HDA emulation (5.0.12 regression; bug #14981)

- Audio: don't crash if the backend is unable to initialize (bug #14960)

- Audio: fixed audio capture on Mac OS X (bug #14386)

- Storage: fixed a possible crash when attaching the same ISO image multiple times to the same VM (bug #14951)

- BIOS: properly report if two floppy drives are attached

- USB: fixed a problem with filters which would not capture the device under certain circumstances (5.0.10 regression; bug #15042)

- ExtPack: black-list Extension Packs older than 4.3.30 due to incompatible changes not being properly handled in the past

- Windows hosts: fixed a regression which caused robocopy to fail (bug #14958)

- Linux hosts: properly create the /sbin/rcvboxdrv symbolic link (5.0.12 regression; bug #14989)

- Mac OS X hosts: several fixes for USB on El Capitan (bug #14677)

- Linux Additions: fixes for Linux 4.5 (bug #15032)

## Version 5.0.12 (2015-12-18)

This is a maintenance release. The following items were fixed and/or added:

- GUI: fixed wrong scrolling behaviour in the VM selector window when a VM item is dragged out of the chooser-pane area

- GUI: fixed the validation of IPv6 port-forwarding rules

- GUI: suppress the first-run wizard if a CD/DVD medium is inserted using the selector UI

- GUI: fixed the Ctrl+Break key sequence scan codes (bug #14927)

- GUI: improved handling of text selection mouse pointer (bug #750)

- Host services: fixed a crash during VM shutdown under rare conditions (5.0.6 regression; bug #14841)

- Shared folders: fixed a sharing violation if a file is opened to check the attributes (Windows hosts only; bug #14450)

- Webcam: passthrough fix for certain devices (Mac OS X hosts only)

- XHCI: fixed broken emulation if software virtualization is used

- XHCI: several fixes

- 3D: fixed state handling under certain conditions (bug #13487)

- Audio: several fixes

- BIOS: added LBA64 support for being able to boot from huge hard disks(bug #7415)

- EFI: fix for Windows 10 guests

- ExtPack: before installing an Extension Pack check if there are VMs running to prevent file system locking issues

- rdesktop-vrdp: source code tarball fixes

- Windows hosts: fixed hang when using VBoxAuthSimple library for VRDP external authentication (bug #14931)

- Windows hosts: fixed a regression which prevented it to attach to a physical network adapter having TCP/IP disabled (bug #14578)

- Windows hosts: fixed a regression which caused multi-port adapters to be shown as a single adapter (bugs #14558, #14622)

- Windows hosts: fixed a regression which caused created host-only adapters to not appear in the list (bug #14437)

- Windows hosts: fixed host-only adapter creation issues related to Windows 10 (bugs #14040, #14545)

- Linux hosts: .desktop file compatibility issue (bug #14808)

- Linux hosts / guests: fixes for RHEL 7.2 (bug #14866)

- Linux hosts: the command for recompiling the host kernel modules was changed again, to /sbin/rcvboxdrv setup (bug #14723)

- Linux hosts: some fixes for PCI passthrough (still highly experimental)

- Linux/Mac OS X hosts: fixed a VM hang during startup under certain circumstances (bug #14933)

- Solaris hosts: added Python 2.7 bindings

- Mac OS X hosts: fixed a possible crash when the default input or output audio device changes

- Mac OS X hosts: fixed a panic under certain conditions

- Linux Additions: prevent the compiler from doing dead-code elemination on vital code in guest / host communication (bug #14497)

- Linux Additions: when mounting a shared folder, explicitly pass the share name so that /proc/mounts contains this name instead of 'none'

- Linux Additions: workaround for a systemd problem in conjunction with SELinux which prevented to properly enable the 'vboxadd' service during while upgrading the Additions

## Version 5.0.10 (2015-11-10)

This is a maintenance release. The following items were fixed and/or added:

- VMM: improved support for certain Intel Atom CPUs (bug #14773)

- VMM: system register emulation fix (5.0 regression; bug #14515)

- GUI: fixed immediate screenshot issue (bug #14108)

- GUI: fixed another 3D overlay window reparenting issue when the VM is switched to full-screen mode on X11 hosts

- GUI: fixed help index (bug #14722)

- GUI: fixed state synchronization issue in the VM manager window when VM was paused from its runtime window

- Audio: fixed suspending/resuming audio streams on VM pause/unpause (bug #14784)

- Audio: properly reset AC'97 audio streams, otherwise there is silence until a non-48 kHz stream is played

- Audio: fixed a small emulation quirk of the AD1980 codec of the HDA device to make recent linux guests work (bug #14653)

- USB: serveral fixes for the xHCI controller

- USB: fixed a crash under certain conditions on hosts with Linux kernels older than version 3.3

- USB: better identification of certain USB devices

- NAT: support TCP in DNS proxy (bug #14736)

- NAT Network: fixed sporadic crashes on Windows hosts (bug #13899)

- API: when creating differencing images (e.g. as part of a snapshot or cloning a VM) use the same disk image variant as the parent image if possible, which means that e.g. a diff image for a VMDK image split into 2 GB files will also be split (bug #14764)

- API: event queue handling fixes preventing loss of certain events at runtime (e.g. new webcam attached), particularly important on Mac OS X hosts

- Webcam: passthrough fix for certain devices (Windows hosts only)

- VBoxManage: don't crash on snapshot restorecurrent / edit if the VM has no snapshots

- VBoxManage: don't crash on controlvm addencpassword (bug #14729)

- Mac OS X hosts: use the correct kernel on certain hosts

- Windows hosts: fixed VRDP external authentication

- Windows hosts: allow to use a shared folder path with extended-length path prefix (5.0 regression; bug #14651)

- Windows hosts: fix a crash in the netfilter host driver under certain conditions (bug #14799)

- Windows host installer: documented and fixed public properties which can be used to control the installation to some extent

- Windows host installer: fixed not starting the actual installation when showing the version information or help dialogs

- X11 Additions: added basic support for X.Org Server 1.18 (3D requires additional fixes)

## Version 5.0.8 (2015-10-20)

This is a maintenance release. The following items were fixed and/or added:

- GUI: Mac OS X: Restore green zoom button for VM windows (it was hidden in previous release to avoid native full-screen issues). For Yosemite and El Capitan this button should work accordingly to the Apple HIG: Full-screen by default, maximize if the user holds the Option key

- Serial ports: fixed wrong IRQ number for the first serial port in the ACPI tables (5.0.6 regression; bug #14659)

- API: fixed a 5.0 regression in VBoxManage setproperty defaultfrontend (bug #14696)

- VBoxManage/vbox-img: conversion to RAW images could result in a disk image containing all zeroes

- Linux hosts: several fixes for systemd integration in .deb / .rpm packages (e.g. bug #14665). The command for recompiling the host kernel modules was changed to /sbin/vboxconfig

- Linux hosts: make host-only interfaces report operstate UP only when they have VMs attached (bug #14526)

- Mac OS X hosts: fix bpf capture and accounting of traffic on bridged and host-only interfaces (bug #14553)

- Windows guests: fixed 3D rendering issues on high resolution displays

- Windows Additions: fixed problems with 3D acceleration on Windows hosts with Intel HD graphics (bug #14670)

- Linux Additions: fix service starting on Debian systems with systemd installed but not in use (bug #14683)

## Version 5.0.6 (2015-10-02)

This is a maintenance release. The following items were fixed and/or added:

- GUI: the update check now uses the HTTP system proxy settings by default

- GUI: About dialog improvements. Copyable version text, do not close dialog on mouse-clicks and focus losing, explicit close button at the bottom of dialog and disabled close button fix on OS X. (bugs #9912, #12749)

- GUI: fixed bug when re-assigning shortcuts (bug #14565)

- GUI: fixed default focus button in message-box dialogs (bug #14486)

- GUI: fixed settings dialog which is opened if the network settings need to be changed at VM startup (5.0 regression; bug #14601)

- GUI: fixed crash during VM start if an early error message needs to be shown, for example Linux kernel modules not present (bug #14646)

- Bridged Networking: fixed handling of guest DHCP requests without UDP checksum when bridging to a wireless interface (bug #14615)

- Audio: latency fixes (Windows hosts only; bug #4088)

- Guest Control: correctly set USERNAME and USERPROFILE environment variables (Windows guests only)

- Guest Control: several fixes

- API: properly restore NAT port forwarding rules when reverting to a snapshot

- Parallel ports: Several fixes allowing to enable two parallel ports for a VM

- VBoxManage: fixed wrong output of debugvm show command

- VBoxManage: fixed hang when specifying logging groups with debugvm log starting with h, for example hex

- Windows hosts: renamed VBoxStartup.log to VBoxHardening.log and provide this log file in the GUI log viewer

- Windows hosts: fixed a small memory leak in the Windows host interface driver (VBoxNetAdp) which caused a BSOD if the driver verifier is enabled (bug #14562)

- Windows hosts: fixed a failure to start VMs on hosts where dsound.dll is not available (bug #14574)

- Windows hosts: another fix for VERR_LDR_MISMATCH_NATIVE errors (bug #14579)

- Windows hosts: fixed host-to-guest communication with bridged networking (bugs #14326, #14457)

- Windows hosts: fixed broken data receiving from the serial device with the named pipe backend if Kaspersky AV is installed

- Linux hosts: Linux 4.3 compile fixes

- Linux hosts: installer fix for certain systems (bug #14627)

- Linux hosts / guests: native systemd support for the host/guest installer scripts. The scripts for re-compiling the kernel modules are now located at /sbin/rcvboxdrv (host) and /sbin/rcvboxadd (Guest Additions)

- Mac OS X hosts: GUI-related fixes for El Capitan

- Mac OS X hosts: fixed a problem with capturing USB devices under El Capitan

- Mac OS X hosts: allow colon character on shared folders (bug #14554)

- Linux Additions: properly set the VBoxService process ID in the PID file (bug #14571)

- Linux Additions: Guest Control fixes (bug #14573)

- Windows Additions: fixed shutting down VBoxTray when running with older VirtualBox host versions

- Windows Additions: fixed video playback with VLC and Windows Media Player when the WDDM driver is used and 3D is not used

- Windows Additions: prevent a possible VLC crash when the WDDM driver is used and 3D is enabled by implementing YV12 surfaces

## Version 5.0.4 (2015-09-08)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed an issue with Windows 10 guest kernel debugging over the network for Hyper-V paravirtualized VMs

- VMM: fixed a bug which prevented reading the saved state of the 'PATM' unit from VirtualBox 4.3.x (bug #14512)

- GUI: changed default OS type for Windows from Windows XP to Windows 7

- GUI: added another pre-defined guest screen resolution (bug #14384)

- GUI: fixed update check which was broken due to changing the location of the root certificates (bug #13096)

- GUI: fixed issues with synchronization of Caps lock / Num lock / Scroll lock on Windows hosts (bug #14302)

- GUI: don't crash during VM shutdown if 2D video acceleration and 3D support are enabled (Mac OS X hosts only)

- GUI: several seamless fixes for certain X11 window managers, also when used in multi-screen setups

- GUI: Log window size, position and cursor-position fixes

- Audio: fixed playing leftover/deprecated audio samples

- Audio: fixed playing audio after suspending the host (5.0 regression; Linux hosts using the ALSA backend)

- Audio: fixed playing short audio samples which were chopped off formerly

- Audio: fixed distortions on OS X when the sample rate of the guest stream and host device don't match

- Storage: fixed raw disk access and flat VMDK image access which would be always opened readonly (5.0.2 regression; bugs #14425, #14461)

- Storage: fixed initial encryption of VDI images after they were compacted (bug #14496)

- VGA: fix for certain graphics modes (bug #14516)

- NAT: don't freeze while the VM is paused if the network attachment mode is changed from/to NAT with activated port forwarding

- OVF: fixed duplicate USB controller entries in exported OVA/OVF (bug #14462)

- Shared Folders: fixed a path separator issue (bug #14434)

- Drag and drop: fixed crashes on OS X hosts when doing host-to-guest transfers

- VBoxManage: another attempt to not deny changing the network adapter type at VM runtime (5.0 regression; bug #14308)

- VBoxManage: fixed broken guestcontrol <VM-Name> list command (5.0 regression)

- VBoxManage: fixed broken Guest Control stdout/stderr output (5.0 regression)

- Mac OS X hosts: fixed remaining problems with activated SMAP (Broadwell and later; bug #14412)

- Mac OS X hosts: fixed broken 3D support (5.0.2 regression; bug #14476)

- Linux hosts: Linux 4.2 fix

- Linux hosts: don't crash on older Linux distributions if the DBus service isn't running (bug #14543)

- Windows hosts: fixed the VERR_LDR_MISMATCH_NATIVE error message (bug #14420)

- Windows hosts: fix for Windows 10 build 10525 and later (bug #14502)

- Windows hosts: fixed network adapter enumeration on Windows 10 (bug #14437)

- Windows hosts: prevent intermittent host network disconnects during VM start/shutdown with bridged networking (bug #14500)

- Windows Additions: fixed the call to the memory allocation function (bug #14415)

- Linux Additions: be more forgiving if the compilation of the vboxvideo module fails (bug #14547)

- X11 Additions: fixed a number of small issues with dynamic resizing and full-screen and seamless modes

## Version 5.0.2 (2015-08-13)

This is a maintenance release. The following items were fixed and/or added:

- VMM: added support for guest crash report MSRs with Hyper-V paravirtualization

- VMM: fixed an issue causing artificially high load averages on Linux hosts

- VMM: fixed a kernel panic with thread-context hooks caused by incompatible changes made to Linux 4.2 kernels

- VMM: fixed a saved state issue with VT-x/AMD-V disabled (5.0 regression; bug #14304)

- VMM: fixed VERR_SUPDRV_TSC_DELTA_MEASUREMENT_FAILED Guru Meditations on certain AMD CPUs (5.0 regression; bug #14370)

- VMM: fixed a crash while creating a guest core dumps via the VM debug facility (5.0 regression)

- VMM: This release has AVX2 passthrough disabled on every host and AVX passthrough disabled for 64-bit VMs on 32-bit hosts. This will be properly fixed in a future 5.0.x maintenance release (see e.g. bug #14262)

- GUI: fixed rare hang and crash on VM shutdown/poweroff

- GUI: X11: fixed few crashes caused by the Qt alien widgets feature

- GUI: X11: fixed various mini-toolbar geometry quirks like positioning, z-order, transparency issues on certain window managers (bug #14257)

- GUI: X11: fixed mini-toolbar minimize button issue under certain window managers (bug #14284)

- GUI: VM menu actions availability should now be properly updated on full-screen/seamless/scaled mode switches

- GUI: disk encryption password validation should be performed when user confirmed the password, not after each entered symbol

- GUI: do not change the VM/group selection in the VM Manager to the newly created VM if it was created by another client (e.g. VBoxManage)

- GUI: Mac OS X: do not treat 'almost maximized' VM windows as 'maximized', watch for the strict window geometry instead

- GUI: improve the quality in scaled mode under some circumstances (5.0 regression; bug #14303)

- VBoxManage: do not deny changing the network adapter type at VM runtime (5.0 regression; bug #14308)

- VRDP: allow Windows 10 RDP clients (bug #14216)

- Audio: fix a possible crash on VM process termination (5.0 regression)

- Storage: improved raw disk access on OS X by unmounting any accessed volume before first use and prevent any mount attempt by the host (bug #14219)

- 3D: basic support for saving/restoring display lists

- Drag and drop: fixed guest to host transfers on OS X hosts

- Drag and drop: fixed memory leak on Windows guests

- Shared Folders: fixed a problem with accessing CIFS shares (bug #14252)

- Shared Folders: improved path conversion between hosts and guests with different path separators (bug #14153)

- API: skip resetting of immutable media when the VM in saved state is started (bug #13957)

- API: fixed method for setting medium IDs which used zero (invalid) UUIDs instead random (valid) UUIDs if no UUIDs were passed (bug #14350)

- API: for Windows host fix detection of API client crashes which have a session open

- OVF: properly export all VBox features including the setting for paravirtualization (bug #14390)

- Mac OS X hosts: El Capitan USB fixes

- Windows hosts: fixed crash when opening Windows dialogs from the VM process on Windows 10 (bug #14351)

- Windows hosts: fixed host-only adapter creation issues on Windows 10 (bug #14040)

- Windows hosts: fixed audio on Windows 10 (bug #14432)

- Linux hosts: more fixes for activated SMAP on Linux 3.19 and newer (Broadwell and later; bug #13961)

- Linux hosts: check then name space before attaching to a host network interface (bug #13795)

- Linux Additions: Linux 4.2 fixes (bug #14227)

- Linux Additions: improved the performance of stat() to speed up certain file operations on shared folders

- Windows Additions: fixed a potential crash in the WDDM driver with Windows 10 (bug #14190)

- Solaris Additions: added support for X.Org Server 1.17

- X11 Additions: various seamless mode fixes, including invisible windows under LXDE

## Version 5.0.0 (2015-07-09)

This is a major update. The following major new features were added:

- Paravirtualization support for Windows and Linux guests to improve time-keeping accuracy and performance (see )

- Make more instruction set extensions available to the guest when running with hardware-assisted virtualization and nested paging. Among others this includes: SSE 4.1, SSE4.2, AVX, AVX-2, AES-NI, POPCNT, RDRAND and RDSEED

- xHCI Controller to support USB 3 devices (see )

- Drag and drop support (bidirectional) for Windows, Linux and Solaris guests

- Disk image encryption (see )

- VMs can now be started in separate mode. The VM process is started headless while the frontend runs as a separate process which can be terminated without stopping the VM

- GUI: VM guest-content scaling support (including 3D acceleration)

- GUI: New User Interface settings page for customizing status-bar, menu-bar and guest-content scaling

- GUI: New Encryption settings tab for customizing encryption options for disk images

- GUI: HiDPI support including application icons and optional unscaled HiDPI output on Mac OS X (including 3D acceleration)

- GUI: Hotplugging support for SATA disks

- New, modular audio architecture for providing a better abstraction of the host audio backends

- Support for the NDIS6 networking framework on Windows (default on Vista and later)

In addition, the following items were fixed and/or added:

- VMM: improved timing on Solaris hosts with older VT-x hosts without preemption timers

- VMM: further improvements for TSC frequency measurements and guest timekeeping

- VMM: debug facility now includes the guest CPU's FPU/SSE/extended state in the core dump

- VMM: fixed a hang under rare conditions on 32-bit hosts

- VMM: several fixes

- GUI: improved HID LEDs synchronization for Mac and Windows hosts. The physical LEDs state now restored together with the VM state

- GUI: take the guest screen aspect ratio into account for the preview window

- GUI: provide direct access to storage media in the VM selector

- GUI: allow to save the VM state from the selector even if the VM is already paused

- VBoxManage: when exporting an appliance, support the suppression of MAC addresses, which means they will be always recreated on import, avoiding duplicate MAC addresses for VMs which are imported several times

- VBoxManage: now supports renaming storage controllers and USB controllers

- Guest Control: major overhaul, for example fixing wrong parameter quoting (bug #13157)

- USB: added USB traffic capturing (see )

- Made resizing X11 guests work more reliably

- API: block the removal of the current snapshot if it has child snapshots (only relevant for VMs without snapshottable hard disks, their presence always prevented removal), which resulted in VM config corruption

- API: mark VM configs with snapshots but without current snapshot as inaccessible, as this combination is nonsense

- API: fix information for some automatically generated events (only with XPCOM, Windows host was not affected), which caused errors when getting some of the attributes over the webservice (bug #12379)

- API: fix crashes in Java API clients using the XPCOM binding, happened with output parameters only (bug #11232)

- API: a number of settings (e.g. network settings) can now also be changed when the VM is in saved state

- API: fixed incorrect resuming of VMs on host-resume unless they were previously paused due to a host-suspend

- API: don't lose the saved state and "current state changed" flag during cloning of a VM

- API: OS type description consistency fix (bug #14162)

- VBoxSVC: don't keep the support driver permanently open

- Main/Properties: properly drop transient guest properties when the VM is powered off

- VRDP: fixed a couple of races which may cause a crash during VM poweroff

- ExtPack: don't fail if the TMP directory contains non-latin1 characters (bug #14159)

- 3D: fix potential race in which might cause a crash on VM termination

- 3D: fixed a possible memory leak in the host service

- Serial: new TCP/IP backend (see )

- Storage: added USB mass storage device class (see )

- Storage: added vbox-img standalone tool for direct manipulation of virtual hard disk images without VBoxManage

- Storage: fixed crash as a result of I/O errors in certain conditions (bug #13105)

- NAT: fixed several potential crashes

- NAT: don't forcibly reset/drop all connections when the link goes down

- Netsniffer: properly handle changing of the trace file name at VM runtime

- Audio: fixed audio output and input when changing the default audio device more than once on OS X

- Audio: fixed audio input on OS X under certain circumstances

- ICH9: fixed the interrupt disable logic for MSI interrupts; should fix old Linux guests with AHCI

- USB: improve playback with USB sound devices attached to the emulated OHCI controller

- Audio: provide Linux guests a different AC'97 audio codec type so Linux ALSA does not mis-detect the link speed (default for new VMs)

- BIOS: fix for booting from SCSI CD/DVD media

- BIOS: fix for reads partially beyond end of disk (bug #14021)

- VRDP: fixed listening for IPv6 on some systems (bug #14038)

- rdesktop-vrdp: upgraded to version 1.8.3

- Linux hosts: fixed a bug which made the netfilter driver ignore certain events (bug #12264)

- Mac OS X hosts: El Capitan fixes

- Mac OS X hosts: fixed a bug which might trigger a host kernel panic if a VM is started and another hypervisor is active

- Solaris hosts: Solaris 12 installer fix

- Guest Additions: added a heartbeat service (see )

- Linux hosts / guests: support for Linux distributions using systemd without sysv emulation (e.g. ArchLinux)

- Windows Additions/WDDM: improved video memory utilization and allow more/bigger guest screens with large resolutions (including HiDPI)

- Linux Additions: added -s parameter to mount.vboxsf to be sloppy with invalid parameters

- X11 Additions: fixed wrong DPI value (bug #14151)

- Mac OS X guests: limit the CPU family for legacy guests

- Solaris Additions: added quiesce support to co-operate with Solaris' fast-reboot feature

## Version 4.3.28 (2015-05-13)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed a Guru Meditation when rebooting certain guests (for example Solaris doing fast reboot) by fixing the implementation for INIT IPI

- VMM: added some information for diagnosing rare VERR_VMX_INVALID_VMXON_PTR Guru Meditations (VT-x only)

- GUI: HID LEDs sync: prevent synchronization if VM window has no focus (Windows and Mac OS X hosts only)

- GUI: fixed drag and drop moving the cursor between guest screens on certain hosts

- 3D: fixed a crash on restoring the VM state on X11 hosts (bug #12737)

- 3D: fixed a crash on restoring the VM state

- 3D: fixed a crash on Linux guest shutdown (bug #12772)

- VRDP: fixed incompatibility with rdesktop 1.8.3

- VRDP: fixed listening for IPv6 on some systems (bug #14038)

- Storage: don't crash if creating an asynchronous I/O context fails (e.g. when starting many VMs) and show a proper error message

- Floppy: several fixes

- Audio: improved the behavior of the volume control for the HD audio device emulation

- USB: increase the number of supported drivers from 3 to 5 (Windows hosts only)

- PS/2 keyboard: synchronize the LED state on VM restore (Windows and Mac OS X hosts only)

- NAT Network: when running multiple NAT networks with multiple VMs, only stop the respective services when stopping VMs (bug #14090)

- NAT: don't kill UDP bindings on ICMP errors (bug #13475)

- NAT: bandwidth limit now works properly with NAT (bug #11485)

- BIOS: fixed the returned size value of the VBE 2.0 PMI function 0Ah (4.2.0 regression; bug #14096)

- Guest Control: fixed parameter quoting in Windows guests (bug #13157)

- Webcam passthrough improvements for Linux (V4L2) hosts to support more webcam models

- API: don't fail starting a VM with VBOX_E_INVALID_OBJECT_STATE under certain conditions (bug #13617)

- API: be more verbose on VBOX_E_INVALID_OBJECT_STATE if a medium is attached to a running VM (bug #13560)

- API: fixed a bug which could result in losing certain screen resize events with multi-monitor guests

- rdesktop-vrdp: fixed path to the keymaps (bug #12066)

- rdesktop-vrdp: switch to version 1.8.3

- Windows hosts: more hardening fixes (e.g. bugs #14051, #14052)

- Linux hosts: another fix for activated SMAP on Linux 3.19 and newer (Broadwell and later; bug #13961)

- Linux hosts: Linux 4.1 compile fix (bug #14081)

- Solaris hosts: fixed using of VNIC templates with Crossbow based bridged networking to be compatible with vanity interface names

- Mac OS X hosts: fixed crash during VM termination under rare circumstances

- Windows Additions/WDDM: improved video memory utilization and allow more/bigger guest screens with large resolutions (including HiDPI)

- X11 Additions: prevent flickering when updating mouse cursor

- Solaris Additions: fixed incorrect usage of 'prtconf' while installing Guest Additions (Solaris 10 only)

## Version 4.3.26 (2015-03-16)

This is a maintenance release. The following items were fixed and/or added:

- GUI: in the snapshots pane, protect the age of snapshots against wrong host time (bug #13955)

- NAT Network: fixed a bug which prevented to propagate any DNS name server / domain / search string information to the NAT network (4.3.24 regression; bugs #13915, #13918)

- NAT Network: don't delay the shutdown of VBoxSVC on Windows hosts

- Mouse support: the mouse could not be moved under rare conditions if no Guest Additions are installed (4.3.24 regression; bug #13935)

- Storage: if the guest ejects a virtual CD/DVD medium, make the change permanent (bugs #9858, #12885)

- VGA: made saving secondary screen sizes possible in X11 guests

- SDK: fixed the VirtualBox.tlb file (4.3.20 regression; bug #13943)

- rdesktop-vrdp: make it work with USB devices again (4.3.14 regression; bug #13901)

- USB: fixed a possible BSOD on Windows hosts under rare conditions

- iPXE: enable the HTTP download protocol on non-Linux hosts (bug #13628)

- Mac OS X hosts: don't panic on hosts with activated SMAP (Broadwell and later; bug #13951)

- Linux hosts: don't crash Linux 4.0 hosts (bug #13835)

## Version 4.3.24 (2015-03-02)

This is a maintenance release. The following items were fixed and/or added:

- VMM: emulation fix for the ENTER instruction under certain conditions; fixes Solaris 10 guests (VT-x without unrestricted guest execution)

- VMM: fix for handling NMIs on Linux hosts with X2APIC enabled

- NAT/NAT Network: fix connection drops when the host's DHCP lease was renewed (4.3.22 regression; Windows hosts only; bug #13839)

- NAT: don't crash on an empty domain list when switching the DNS host configuration (4.3.22 regression; Mac OS X hosts only; bug #13874)

- PXE: re-enable it on Windows hosts (4.3.22 regression; Windows hosts only; bug #13842)

- Shared Folders: fixed a problem with Windows guests (4.3.22 regression; bug #13786)

- Audio: improved record quality when using the DirectSound audio backend

- VBoxManage: when executing the controlvm command take care that the corresponding VM runtime changes are saved permanently (bug #13892)

- Windows Installer: properly install the 32-bit version of VBoxRes.dll on 32-bit hosts (bug #13876)

- Linux hosts / guests: Linux 4.0 fixes (bug #13835)

- OS/2 Additions: fixed mouse integration (4.3.22 regression; bug #13825)

## Version 4.3.22 (2015-02-12)

This is a maintenance release. The following items were fixed and/or added:

- VMM: refined measurement of TSC frequency on the host, improves timekeeping for guests

- VMM: decreased CPU load resulting from guest MMIO writes to the virtual APIC

- VMM: fixed interception of debug exceptions, observed while using the dbx debugger on Solaris guests (VT-x only)

- GUI: 3D overlay window positioning code improved, fixed potential misplacement of 3D accelerated guest graphics content

- GUI: fixed accident SSL authentication failures during update check on Windows hosts (bug #12969)

- GUI: never send the "ACPI power" keyboard scancode to the guest, we have the ACPI power button for that

- GUI: was unable to properly restore seamless mode VM from snapshot/saved-state under some circumstances

- VBoxHeadless: don't crash if 3D is enabled in the VM settings (bug #10250)

- ATA: fixed several passthrough issues (bugs #12310, #1360)

- Audio: fixed DirectSound failure when the the host has no audio input device (Windows hosts only; bug #9205)

- SB16: fixed compatibility issue (bug #13769)

- Storage: fixed broken CD/DVD passthrough when using the IDE controller (bug #12310)

- NAT: new ping proxy for Windows hosts (bug #11871)

- NAT: Properly report outbound connect(2) failures to guest with TCP RST or ICMP (bug #10525)

- NAT Network: no need for frequent wakeups in VBoxNetDHCP and VBoxNetNAT (bug #11681)

- Host-only adapter: prevent Windows from creating an "Unidentified network" (bug #9688)

- Bridged Networking: don't leak host-to-guest traffic to the wireless network when bridging to a wireless interface (bug #13714)

- Main: fixed a possible race when changing the medium leading to a deadlock under rare conditions (bug #13722)

- VBoxManage: fixed return code if starting a VM failed (bug #13773)

- Settings: on Windows host, do not use environment variable HOME at all, the settings location is derived from the user profile directory (bug #7689)

- API: fixed 2 deadlock opportunities related to medium handling (bugs #13789, #13801, thank you Alexander Urakov)

- API: fixed bug in XPCOM which created too few worker threads, sporadically resulting in a deadlock (bug #13802, thank you Alexander Urakov)

- SDK: fixed a garbage collection leak in the Python VirtualBox webservice API binding (bug #13817)

- Linux hosts: fixes for activated SMAP (Broadwell and later, bug #13820)

- X11 guests: prevent unwanted hiding of guest screens on multi-monitor guests (bug #13287)

- X11 guests: added support for X.Org Server 1.17

- X11 Additions: fixed a memory leak in VBoxService if libdbus is available but dbus-daemon isn't running (bug #13770)

- Windows Additions: prevent VBox WDDM driver from loading if host reports weak OpenGL capabilities. 3D content now can be shown over Remote Desktop connection

- Winodws Additions: some fixes for recent Windows 10 Previews

- Linux Additions: fixed a compatibility issue with 64-bit Linux 2.4 kernels

- Linux Additions: fixed a potential use-after-free when unloading the VBoxGuest module

- Linux Additions: Linux 3.19 fixes (bug #13741)

## Version 4.3.20 (2014-11-21)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed reboot hang of 32-bit Windows SMP guests (bugs #13319, #13462)

- VMM: proper Math Fault handling with certain legacy guests (bug #9042, AMD hosts)

- VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT on older CPUs that don't support MSR bitmaps (VT-x only; bugs #13034, #13125, #13311, #13425, #13426, #13463, #13585)

- GUI: fix 3D overlay window reparenting issue when VM goes to full-screen mode on X11 hosts

- GUI: fix occasional loss of focus in full-screen mode on X11 host systems (4.3.16 regression)

- GUI: Mac OS X: wizards should have Cancel button (bug #12541)

- GUI: added a global option to prevent automatic raising of the new window by mouse move with multi-screen guests (bug #8878)

- API: accept remote display port 0 as the default RDP port (bug #8534)

- VBoxManage: fixed crash when executing showvminfo command under certain circumstances (bug #13190)

- ACPI: fixed occassional Guru Meditations in ACPI timer code (4.3.18 regression; bug #13521)

- EFI: improved performance of IDE disk access

- EFI: fixed a bug in the EFI video driver which prevented Windows to boot in UEFI mode (bug #12022)

- EFI: properly announce the amount of RAM for big VMs (bugs #11103 and #13211)

- Storage: fixed a crash under certain cicrumstances when a medium was ejected from a drive attached to the SATA controller without inserting a new medium before pausing or closing the VM (4.3.16 regression)

- Storage: fixed an interrupt acknowledge issue causing hanging guests or slower I/O (4.3.18 regression)

- Storage: fixed broken resume after the VM was suspended due to a full disk if host I/O caching is used

- Storage: fixed a Guru Meditation under certain conditions when using the DevLsiLogic controller with VMs running in software virtualization mode (4.3 regression; bugs #12254, #12655, #12709, #12774, #12886)

- Guest Control: fixed a bug which might lead to a crash during recursive copy

- SDK: Java COM bindings fixes

- iPXE: enable the HTTP download protocol (bug #13628)

- Runtime: do not use a fixed stack size creating temporary threads during initialization (bug #13038)

- Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting (4.3.14 regression; bug #13187)

- Windows hosts: fixed DirectSound host audio failure under certain conditions (bug #13418)

- Windows hosts: fixed additional cases of 4.3.14 regression whereby AltGr stopped working for some people (bug #13216)

- Windows Additions: preserve guest monitor layout when resizing Windows 7 or newer guests

- Linux Additions: Linux 3.18 compile fixes (bug #13515)

## Version 4.3.18 (2014-10-10)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed a potential misbehavior after restoring the A20 state from a saved state

- GUI: fixed full-screen mode mini-toolbar related regressions for different platforms and window managers (bug #13369)

- GUI: X11: fixed full-screen mode Unity panels quirk caused by mini-toolbar code changes in last release (bug #13365)

- GUI: X11: added possibility to use legacy full-screen mode as the new one can cause multi-screen issues under Unity, see (bug #13365)

- GUI: Mac OS X: fixed full-screen mode artifact causing black screen when 3D acceleration was enabled on 10.10 Yosemite hosts (bug #13448)

- GUI: Mac OS X: fixed regression in user-space swiping from/to VBox in full-screen mode

- GUI: Mac OS X: fixed issue with switching to VBox in full-screen mode through Alt+Tab and Mission Control

- Storage: fixed data corruption when resizing huge VHD images under certain circumstances (bug #11960)

- Storage: fixed a rare hang during startup when the BIOS enumerates the storage devices attached to the SATA controller

- Storage: follow the spec with AHCI interrupt acknowledge (bug #13474)

- Storage: fixed broken iSCSI authentication (4.3.14 regression; bugs #13386, #13435)

- NAT Network: properly parse port forwarding rules to allow UDP rules

- USB: fixed a crash on Linux hosts with older Linux kernels (bug #13400) and several other fixes

- ACPI: fixed ACPI timer anomalies (bug #12076)

- Guest Control: fixed a memory leak (bug #13434)

- Main: when removing a VM, do also remove the VBoxStartup.log file which might exist on Windows hosts (bug #13478)

- Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting (4.3.14 regression; bug #13187)

- Windows hosts: propagate the process startup information to the child process (4.3.14 regression; bug #13243)

- Mac OS X hosts: don't force using the discrete GPU (bug #11111)

- Windows Additions: some Windows 10 tweaks

- X11 guests: fix a bug handling video driver display properties which prevented GNOME Shell on Fedora 21 from starting

- Linux hosts / guests: fixed a few remaining warnings in the kernel log if memory allocation fails (bug #11171)

## Version 4.3.16 (2014-09-09)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed restoring 32-bit FPU state on 64-bit capable VMs and restoring guest FPU in raw-mode VMs (bug #12646; 4.3 regression)

- GUI: properly restore normal/scale mode guest-screen size after exiting full-screen/seamless mode

- GUI: mini-toolbar should provoke less artifacts/conflicts with 3D guest rendering

- GUI: Mac OS X: Native full-screen multi-screen transition was able to blackout host-screens for nearly minute

- GUI: X11: Modern window managers should now use native full-screen multi-screen mapping API

- GUI: added extradata item for configuring the mouse capture behavior, see (bug #3506)

- Storage: fixed a VBoxSVC crash when querying an iSCSI target with authentication configured (4.3.14 regression)

- Storage: fixed a rare data corruption during reads if another allocating write is running concurrently and accesses the same range

- Storage: fixed a rare crash for certain VHD images from other products

- Storage: fixed a rare release assertion when using the AHCI controller

- Floppy: fixed read errors and guest memory corruption when running under control of QEMM

- 3D: added experimental support for rendering on offline GPUs for Mac OS X host

- 3D: fixed white window appearing on entering FullScreen mode on Mac OS X host

- 3D: fixed video recording support for 3D data regression (bug #13073)

- 3D: fixes for MS Office 2013 support

- 3D: several fixes

- Bridged Networking: improved IPv6 support when bridging to a wireless interface

- NAT: prevent internal DNS service from stuck in host-resolver mode when host was switched from one network to another one while host was sleeping (Mac OS X hosts)

- NAT: preserve DF (if possible) and TOS when proxying outbound UDP datagrams (bugs #9440, #12309)

- NAT: don't let multicast datagrams out (bug #7338)

- NAT: fixed handling of large incoming UDP datagrams on Windows hosts (bug #12136)

- NAT: fixed handling of the RFC 1533 DHCP PAD option

- NAT Network: fixed inbound half-close on Windows hosts

- NAT Network: preserve IPv4 DF (if possible), TTL, TOS and IPv6 Hop Limit when proxying outbound UDP datagrams

- VRDP: fixed a rare crash when using remote audio input

- USB: fixed several regressions from 4.3.14 (bug #13320)

- Audio: made the HDA sound emulation work with certain Mac OS X guests (e.g. Mountain Lion)

- Windows hosts: fixed startup problems on certain Windows hosts due to conflicts with anti-virus software (4.3.14 regression; bug #13187)

- Windows hosts: fixed 4.3.14 regression whereby AltGr stopped working for some people (bug #13216)

- X11 hosts: made the extra key on Brazilian Thinkpads work (bug #8745)

- X11 hosts: fixed a problem of input focus cycles and immediately released key presses in full screen mode (bug #13238)

- Linux hosts: fixed flooding the kernel log with USB related messages when passing through certain USB devices to a VM (bug #13085)

- Linux guests: stop applications crashing when drm_wait_vblank is called (bug #13265)

- Linux guests: fix a crash in gnome-session (bug #13335)

- X11 guests: do not start VBoxClient over an SSH connection (bug #13107)

- X11 guests: added support for X.Org Server 1.16 (bug #13207)

- X11 guests: fixed a wrong parameter in the video driver which caused problems with full-screen X11 clients (bug #2748)

- VirtualKD: introduced stub/loader device for speeding up Windows kernel debugging, details see http://virtualkd.sysprogs.org/

## Version 4.3.14 (2014-07-15)

This is a maintenance release. The following items were fixed and/or added:

- VMM: more fixes for MSR emulation on certain hardware (bugs #12784, #12949, #13034)

- VMM: improve MSI handling under rare circumstances (only relevant for the ICH9 chipset)

- VMM: fixed #UD exception for 64-bit guests with the EFER.SCE bit and the SYSCALL instruction (VT-x only; 4.3 regression; bug #13008)

- VMM: fixed timekeeping after resuming SMP guests

- VMM: properly wake up a halted VCPU on NMI/SMI

- GUI: fixed a potential crash

- GUI: fixed stuck AltGr key on Windows hosts (bug #2537)

- GUI: fixed a potential error during the version check

- GUI: shortcut change should not require Enter/Return (or other trigger) to confirm (bugs #12828, #12847, #12937, #13087)

- GUI: fixed update check which was broken due to changing the location of the root certificates (bug #13096)

- VBoxManage: fixed typo in showvminfo --machinereadable (bug #13176)

- NAT: fixed inbound half-close (bug #13116)

- NAT: fixed slow upload speed under certain conditions (bug #10034)

- NAT Network: fixed potential loss of inbound TCP data

- NAT Network: fixed potential infinite stalls of TCP connections over IPv6

- NAT Network: fixed resets of TCP connections on Windows hosts

- NAT Network: fixed inbound half-close on Mac OS X hosts

- NAT Network: fixed socket leak on Solaris hosts

- NAT Network: fixed ping of mapped host loopback on Mac OS X and Solaris hosts, fixed proxying of IMCP errors on Mac OS X

- Host-Only Network: fixed SNMP ifConnectorPresent value on Windows (bug #13143)

- Storage: fixed a possible crash with CD/DVD passthrough under certain circumstances

- Storage: fixed a crash when trying to open an inaccessible QED or QCOW image (bug #12613)

- Storage: fixed data corruption or read errors under rare circumstances

- AHCI: fixed a crash under rare circumstances

- USB: performance fixes

- ICH9: properly reset MSI capability on reset

- Keyboard: active modifier keys during suspend were stuck after resuming the host

- 3D: fixed misbehavior with huge guests (i.e. guest more than 4GB guest memory

- 3D: several fixes

- API: properly detect the Windows 8.1 guest OS type (bug #13090)

- ExtPack: cleanup of dangling uninstallation directories

- Linux hosts / guests: compile fix for EL7 (bug #12638)

- Linux Additions: made 3D pass-through work with recent versions of Mesa in the guest (bug #12941)

- Linux Additions: Linux 3.16 fixes (bug #13123)

- Mac OS X hosts: when scanning for host CD/DVD devices also consider BlueRay devices

- Mac OS X hosts: fixed host shutdown and reboot delay caused by running VBoxSVC process in some cases

- OS/2 Additions: fixed gengradd.dll library name (bug #12785)

- Solaris Additions: fixed permissions of files and directories located on shared folders

- Windows host installer: fixed the need for rebooting Windows after installation or upgrade, extended logging for NetFlt/NetAdp (un)installation

## Version 4.3.12 (2014-05-16)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed an occasional Guru Meditation (Mac OS X hosts only; bugs #12727, #12954)

- VMM: fixed a rare condition that would fail to invalidate guest TLB entries or would invalidate them when not required (Windows hosts only)

- VMM: fixed a VERR_NOT_SUPPORTED Guru Meditation seen with certain guests, e.g. OpenServer 5.0.7

- VMM: more fixes for MSR emulation on certain hardware (bugs #12240, #12875)

- GUI: fixed mouse positioning with mouse integration disabled and multiple guest screens (Windows hosts only; bug #9059)

- GUI: fixed crash in VM manager (bug #12878)

- GUI: fixed crash under rare conditions on entering/exiting full-screen/seamless mode

- Shared Clipboard: don't stop working after taking a snapshot (bug #12700)

- AHCI: fixed a crash under rare circumstances

- API: fixed a hang during VM shutdown under rare conditions

- NAT: fixed generation of malformed ICMP error datagrams (4.3.10 regression)

- NAT: fixed potential crash in DNS proxy

- NAT Network: don't drop port forwarding rules after some time

- NAT: fixed ARP cache corruption and network loss in Windows guest caused by iSCSI service activity

- USB: improved check if a storage device is currently mounted to the host when the device is about to be attached to the VM (Mac OS X hosts only; #11038)

- 3D support: several fixes, including better support for Ubuntu 14.04

- VRDP: fixed a potential crash on client disconnect (bug #12858)

- VBoxSVC: fixed a race when a new client is started a few seconds after the last client terminated (Windows hosts only; bugs #11309, #12509)

- VBoxSVC: fixed VirtualBox.xml registry corruption after VM renaming

- VBoxSVC: fixed a potential crash caused by incorrect USB device filter (Mac OS X hosts only; #11038)

- Windows hosts: partly support 32-bit COM on 64-bit systems

- Windows host installer: implemented merge module (msm) support

- Linux hosts: fixed dependency of boot script on older Debian systems (bug #12262)

- Linux guests: fix symbolic link to shared folder helper (bug #12879)

- Linux Additions: don't crash VBoxService during guest execute for users without a password (bug #12994)

- Linux Additions: fixed a bug in guest execution where the guest process terminated with VERR_INTERRUPTED to the host

## Version 4.3.10 (2014-03-26)

This is a maintenance release. The following items were fixed and/or added:

- VMM: more work on improving the emulation of certain MSR registers on certain host CPUs (e.g. bugs #12734, #12736, #12744, #12748, #12686, #12770)

- VMM: fixed single-stepping for real-mode guests (VT-x without unrestricted guest execution) and some I/O instructions (bug #12636)

- VMM: fixed a potential problem with COW pages if nested paging is not available

- GUI: Mac OS X: experimental native full screen support for Mountain Lion and Mavericks (bug #12292)

- GUI: Mac OS X: removed the mini-toolbar minimize button which doesn't work under Mac OS X full screen mode anyway

- GUI: experimental HID LEDs synchronization for Windows and Mac OS X hosts: fixed keyboard re-synchronization if the feature is disabled (as done by default; bug #12758)

- GUI: fixed a potential crash when opening the preferences menu (bug #12862)

- OVF: fixed a crash of the VirtualBox Manager when re-starting guest export (bug #12586)

- 3D support: several fixes

- HGCM: fixed a problem with saved states which could cause several guest misbehavior after a VM was started from a saved state

- Storage: fixed a bug preventing to compact differential snapshots under certain conditions

- VBoxSVC: fixed a segmentation fault on Linux hosts if a very long path exists under /dev (bug #12760)

- API: fixed guest misbehavior under certain conditions if a storage medium was attached or removed at VM runtime

- Windows installer: make the --silent parameter work again (bug #12764)

- Mac OS X Networking: prevent local traffic (VM-to/from-host) from leaking to wire (bug #12750)

- Windows Additions: fixed the environment for guest processes (4.3.8 regression; bug #12782)

- Windows Additions/WDDM: fixed divide by zero exception with multiple guest screens under certain conditions

- Windows Additions/WDDM: fixed crashes with 2D video acceleration enabled (4.3.8 regression; bug #12745)

- Linux Additions: install correctly on Ubuntu guest systems with a /usr/lib64 directory (bug #12513)

- X11 Additions: fix for the VBoxClient process not exiting correctly (bug #12348) and consuming too much processor time

## Version 4.3.8 (2014-02-25)

This is a maintenance release. The following items were fixed and/or added:

- VMM: more work on improving the emulation of certain MSR registers (e.g. bugs #12224, #12544)

- VMM: fixed a VERR_INVALID_RPL Guru Meditation when booting certain guests (bug #11350)

- VMM: experimental support for SSE 4.1 / SSE 4.2 passthrough, see the user manual how to enable it (bug #8651)

- VMM: fix for recent Linux kernels with software virtualization

- GUI: experimental HID LEDs synchronization for Windows hosts, see

- GUI: warn the user if the Oracle Extension Pack is not installed and the user tries to activate the remote display feature (bug #9104)

- GUI: make sure that a minimized guest (using mini toolbar in full screen / seamless mode) keeps the minimized state (bug #12199)

- GUI: popup banner's "do not show this message again" check-box replaced with corresponding button

- GUI: network adapter cables can now be connected/disconnected directly through the running virtual machine Devices / Network menu a Network status-bar indicator

- GUI: the new VM wizard now proposes 64-bit guests on 64-bit hosts by default; better distinction between 32-bit OS types 64-bit OS types (bug #12533)

- GUI: better error message if appliance import fails (bug #12657)

- GUI: allow to set host-combination to 'None' using the Global settings / Input page (bug #12730)

- GUI: don't switch the guest to a black screen during online snapshot merge (4.3 regression)

- VBoxManage: when exporting an appliance, support the suppression of MAC addresses, which means they will be always recreated on import, avoiding duplicate MAC addresses for VMs which are imported several times

- AHCI: fixed a VM hang during suspend under certain circumstances

- AHCI: fixed a VM hang during online snapshot merge under certain circumstances

- AHCI: fixed a bug which resulted in Windows XP guest hangs if a SATA CDROM is attached (bug #12417)

- AHCI: fixed a Guru Meditation under certain conditions

- AHCI: ejecting a CD/DVD medium failed under certain conditions

- AHCI: disk hotplugging fixes

- NAT: transparent handling of host sleep/resume and network configuration changes if the dnsproxy is enabled or if the hostresolver is used (bug #12441)

- NAT: fixed crash and misbehaviour under some circumstances with ICMP packets having TTL=1

- NAT Network: fixed IPv6 reassembly

- NAT Network: ping proxy implemented

- OVF: fixed reading of the OVF 0.9 section element (4.3 regression; bug #12345)

- OVF: several fixes

- 3D support: several fixes, multiscreen fixes (e.g. bug #9124)

- 3D support: include 3D content in captured videos (bug #12666)

- 3D support: include 3D content in captured screenshot (bug #11758)

- VGA: proper handling of legacy graphics modes if the Guest Additions are active (bug #6649)

- USB: fixed crash during isochronous transfer under rare circumstances

- BIOS: better disk geometry handling of SCSI drives

- API: fix crashes in Java API clients using the XPCOM binding, happened with output parameters only (bug #11232)

- VBoxSVC: documented the handling of host power management events (see ) and added an extradata item for configuring the handling of the battery-low event (bug #9925)

- VBoxSVC: fixed a bug which could trigger a crash if a VM snapshot was restored the second time and the VM has associated bandwidth groups (bug #12569)

- VBoxSVC: properly detect ifconfig if located in /bin (bug #12713)

- Shared Folders: fixed a failure to restore transient shared folders when starting a VM from a saved state (bug #12578)

- Mac OS X hosts: fixed issue when the application icon was frozen in the dock if the bridging interface was not connected to a network (bug #12241)

- Linux hosts: also consider the physical package ID when determining the number of physical CPU cores

- Linux hosts / guests: don't warn in kernel log if memory allocation fails (bug #11171)

- Solaris hosts: fixed the autostart SMF script (bug #11720)

- Windows hosts: fixes for non-ANSI code page user names and similar environment contents (bug #12596)

- Windows hosts / guests: fixed setting and using a guest user's process environment variables (relevant for Guest Control)

- Windows Additions: fixed handle leaks in VBoxTray (bug #12563)

- Windows Additions: fixed a crash while detecting active guest users

- Windows Additions: fixed restoring backed up D3D files on XPDM -> WDDM upgrade

- Guest Control: fixed setting and using a guest user's process environment variables

- Linux Additions: support Enterprise Linux 6.5 kernels (bug #12505)

- Linux Additions: fixed CPU hot-remove on newer Linux kernels

- Linux / Solaris Additions: don't automount a shared folder which is already mounted

- X11 Additions: support X.Org Server 1.15 (bug #12623)

## Version 4.3.6 (2013-12-18)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT caused by VMCB caching with nested paging on certain AMD CPUs (bug #12451)

- VMM: fixed a Guru Meditation VERR_VMX_UNEXPECTED_INTERRUPTION_EXIT_TYPE while intercepting debug exceptions (VT-x only; bug #12410)

- VMM: fixed a Guru Meditation VERR_SVM_UNEXPECTED_EXIT while intercepting debug register accesses (AMD-V only; bug #12481)

- VMM: fixed a VERR_SSM_STRUCTURE_MAGIC error when trying to load a saved state made with VBox 4.3.4 when VT-x/AMD-V is disabled. Unfortunately, VBox 4.3.4 produced broken saved states for this configuration so you have to discard these states (bug #12414)

- VMM: added a few more MSRs to the whitelist required by certain guests (bug #12245)

- GUI: fixed deleting of inaccessible VMs (4.3 regression; bug #12205)

- GUI: fixed warnings in VM settings / number of guest processors (bug #12480)

- Main: don't automatically enable 64-bit guests on 64-bit hosts if VT-x/AMD-V is not available (bug #12424)

- Main: always expose the DMI memory information to Windows 2012 guests (bug #12017)

- Main: fixed occasional crashes on guest display resolution change (bug #7063)

- Main: fixed reporting back temporary name when calling IGuestSession::DirectoryCreateTemp() (bug #12498)

- API: fix for a hang when launching a GUI VM through the API, which crashes due to GUI unavailability

- Storage: fix for BLKCACHE_IOERR runtime errors under rare circumstances (bug #11030)

- Network: allow to start more than 5 PCNet instances (bug #12426)

- E1000: if the cable was disconnected before the guest initialized the device, the link status was not properly set to 'down' after the initialization completed despite the fact that there was no connection

- 3D support: fixed offset of guest 3D image elements (Mac OS X Retina hosts only; bug #11021)

- Solaris hosts: fixed accessing the host driver from non-global zones (4.3 regression; bug #12271)

## Version 4.3.4 (2013-11-29)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fix for a bug in the Local APIC emulation causing a BSOD when booting certain guests (4.3.0 regression; bug #12240)

- VMM: fixed loading of saved states if VT-x/AMD-V was disabled (4.3.2 regression; bug #12291)

- VMM: fixed single-stepping inside the guest for certain instructions (VT-x only; bug #10947)

- VMM: fixed a performance issue involving APIC accesses after rebooting a VM (4.3.0 regression; VT-x only; bug #12296)

- VMM: fixed TPR patching to be enabled for 32-bit guests even when the chosen guest type is 64-bit (4.3.0 regression; AMD-V only)

- VMM: fixed occasional VINF_EM_TRIPLE_FAULT errors on hosts without the unrestricted guest execution feature (bug #12198)

- GUI: don't bother the user with the BPP warning if no Guest Additions are installed

- GUI: fixed machine-window paint artifacts on VM reboot / guest-screen resize

- GUI: make sure the assigned license and description are attached to the exported appliance

- GUI: fixed bugs in close VM action restrictions handling (bug #12333)

- GUI: fixed incorrect wizards text colors for some unusual look and feel styles (bug #11743)

- GUI: should restore seamless mode as soon as possible after VM reboot or shutdown

- GUI: fixes for medium enumeration

- GUI: the OS X hot corners were not accessible while a VirtualBox VM is running (Mac OS X hosts only; bug #4139)

- GUI: fixed an old bug which bared the host from cleanly shutdown / reboot if the VM selector window is open (Mac OS X hosts only; bug #8254)

- Host-only Network: fixed creating of host-only network interfaces (4.3.0 regression; bug #12182)

- NAT: don't run into an infinite loop in case the host cannot access any DNS server (4.3.0 regression; bug #12300)

- NAT: don't re-connect the cable if the DNS information changes and the cable was disconnected before (4.3.0 regression; bug #12225)

- NAT: fixed several issues with automatically starting / terminating of NAT networks on VM start / stop and configuration changes

- VBoxNetDHCP: don't block prevent VBoxSVC from terminating (bug #12264)

- 2D Video acceleration: fix crashes on presentation mode switches (bug #9194)

- BusLogic: allow to run VMs with more than one BusLogic SCSI controller enabled

- Keyboard: fixed a VM crash if a VM was resumed from a saved state where at least one key was pressed (bug #11289)

- VBoxSVC: fixed a heap corruption under certain conditions (4.3.0 regression)

- VBoxSVC: fixed a race leading to a hang during initialization (bug #12349)

- OVF: fixed import logic for OVF appliances containing multiple VMs

- OVF: improved logic for finding an appropriate image format during OVF import

- API: block the removal of the current snapshot if it has child snapshots (only relevant for VMs without snapshottable hard disks, their presence always prevented removal), which resulted in VM config corruption

- API: mark VM configs with snapshots but without current snapshot as inaccessible, as this combination is nonsense

- API: fixed information for some automatically generated events (only with XPCOM, Windows host was not affected), which caused errors when getting some of the attributes over the webservice (bug #12379)

- SDK: extended the functionality coverage for the C bindings

- Guest Control: various bugfixes and improved VBoxManage help (bugs #8072, #11044, #12336, #12338, #12346, #12371)

- Windows hosts: another attempt to fix the massive DPC latency (bug #6242)

- Windows host installer: make registering file extensions optional, contributed by Tal Aloni (bug #8009)

- Mac OS X hosts: properly sign the kernel extensions for Mavericks hosts (bug #12256)

- Mac OS X hosts: fixed a bug where the VirtualBox dock icon was not properly removed from the dock after a VM terminated preventing Mavericks hosts from shutting down (bug #12241)

- Mac OS X hosts: fixed minor installer issue (bug #12275)

- Linux hosts / guests: Linux 3.13 compile fixes (bug #12358)

- Linux guests: build the vboxvideo kernel module correctly on OL/RHEL 6.1 guests (bug #11996)

- Linux guests: make 3D work on Slackware 14.1 (bug #12320 comments 3 and 4)

- Guest Additions/3D: fixed an occasional dead-lock (bug #12319)

- Windows Additions/3D: fixed possible memory leaking (bug #12228)

- Windows Additions/XPDM: use separate tables containing valid video modes for each virtual monitor

- Windows Additions: fixed automatic logins for Vista and newer Windows guests (bug #12332)

## Version 4.3.2 (2013-11-01)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed restoring of the auxiliary TSC MSR in VT-x that caused host BSODs on Windows 8.1 hosts and unpredictable behavior on other hosts (bug #12237)

- VMM: provide fake values for a couple of MSRs to make more guests happy on certain hosts

- VMM: fixed detection of VT-x on certain machines where the BIOS would not set the VMX LOCK feature bit, which affected the VM settings in the GUI

- VMM: fixed TPR threshold which caused BSODs on Windows XP guests that use the I/O APIC (VT-x only; bug #12227)

- VMM: fixed PATM saved state incompatibility for software virtualized VMs (bug #12222)

- VMM: don't fail if AMD-V isn't available if the VM is configured to use software virtualization

- GUI: fixed guest resize breakage on visual representation mode change (when switching from normal to full screen etc)

- GUI: make sure the guest screen is resized after restoring a VM from a saved state if the host screen size changed

- GUI: disabled SCROLL LED sync from HID LEDs synchronization (Mac OS X hosts only)

- Webcam passthrough improvements including GUI support (see )

- Guest Control: implemented more `IGuestSession` methods

- Guest Control: added support for deleting and renaming guest files + directories in VBoxManage

- Guest Control: various bugfixes

- API: incorrect handling of hardware UUID default value, resulting in an all zero DMI/SMBIOS UUID, which leads to Windows requesting re-activation (4.3 regression; bug #12244)

- 3D support: fixed crash on shutdown if 2D video acceleration is enabled (Mac OS X hosts only)

- 3D support: miscellaneous fixes

- Storage: fixed detection of CD/DVD media when switching from an empty to a host drive with passthrough enabled

- Storage: fixed hang of the VM process when the disk is full under certain circumstances

- NAT: listen for changes of NAT Network setting at runtime

- NAT: NAT Network DHCP server now saves leases to a persistent storage

- Main: monitor changes in host DNS configuration

- Mac OS X host: reworked a mechanism of adding a VM desktop alias from the VM selector

- Mac OS X installer: remove old kernel extensions during upgrade (bug #12258)

- Linux Additions: correctly set umask before installing (bug #12166)

- X11 Additions/3D: fix freezes starting 3D desktop (bug #11503, thank you Sam Spilsbury)

- X11 Additions/3D: fix depth buffer support (bug #11905)

- X11 Additions/3D: fix Age Of Empires 3 rendering (bug #11331)

- Windows Additions/3D: fix Google Earth plugin rendering

- Windows Additions/WDDM: autoresize fixes

## Version 4.3.0 (2013-10-15)

This is a major update. The following major new features were added:

- VMM: major rewrite of the VT-x code and the AMD-V code including many bug fixes and performance improvements (for example bug #9659)

- VMM: introduced a lightweight instruction interpreter for situations not handled by hardware virtualization

- GUI: extended messaging mechanism (new non-modal popup overlays used to show non-critical warnings and provide user with additional information)

- GUI: keyboard shortcuts management (input page of global preferences extended with possibility to edit general keyboard shortcuts for VirtualBox Manager and Virtual Machine)

- GUI: video capturing support (bug #4766)

- Added USB touch device emulation

- Added experimental support for webcam passthrough complementing USB passthrough (see )

- Added SCSI CD-ROM emulation, including boot support

- VRDP: support for IPv6

- Guest Control: guest sessions now are running in dedicated, impersonated session processes (needs at least Guest Additions 4.3 installed)

- Guest Control: implemented `IGuestFile` support

- NAT: experimental virtual router mode: several VMs are attached to the same internal network and share one NAT service (see )

In addition, the following items were fixed and/or added:

- VMM: significantly improved performance of NetWare 5.x/6.x guests on host systems without nested paging support

- VMM: fixed losing host NMIs while in VT-x guest-context

- VMM: changed order of actions in emulated task switch (bug #10532)

- VMM: allow to activate VT-x while in SMX mode and provide more information if that is not possible

- GUI: update check uses https

- GUI: numerous minor internal cleanups and bug fixes

- GUI: HID LEDs synchronization when switching between guest window(s) and host (Mac OS X hosts only)

- GUI, VBoxManage: when unregistering a VM, also unregister the hard disk images which are used exclusively (bug #10311)

- GUI: use the number of physical presented processor cores instead of the number of logical processor cores to check if the users assigned too many virtual CPUs to the guest

- Snapshots: made live snapshots work again (bug #9255)

- Teleportation: made it work again (bug #9455)

- Storage: implemented AHA-154x compatibility mode in the emulated BusLogic SCSI HBA

- Storage: significantly improved performance of large ATAPI PIO transfers (BeOS, Minix 3 guests affected)

- Storage: added floppy formatting emulation (NB: cannot be used to change existing media geometry)

- Settings: global and per-VM default frontend configuration, useful to select the use of alternative VM frontends

- Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance and may trigger crashes

- Settings: the per-VM hwvirtextexcl setting has been replaced by a global hwvirtexclusive property

- Main: new event queue implementation which does not use the host's native event queue for processing VirtualBox events anymore

- Main: eliminate the use of SysV semaphores on all host OSes other than Windows, namely Linux, Solaris and Mac OS X, with the consequence that no system reconfiguration is needed to run more than approximately 100 VMs

- Main: use the XDG standard configuration folder instead of .VirtualBox on systems where it is appropriate (bug #5099)

- Main: extension pack framework can now support loading HGCM modules, contributed by Jeff Westphal

- VBoxManage: list more information about hard disk/DVD/floppy media, and support the `--long` option to show really all available details

- VBoxManage: added support for optional command line parameters for the automatic Guest Additions update

- VBoxManage: added support for listing active guest sessions, guest processes and/or guest files via `guestcontrol list <all|sessions|processes|files>`

- VBoxManage: added support for closing active guest sessions via `guestcontrol session close --session-id <ID>| --session-name <name or pattern>|--all`

- VBoxManage: added support for terminating active guest processes via `guestcontrol process kill|close|terminate --session-id <ID>| --session-name <name or pattern> <PID> ... <PID n>` or `guestcontrol [p[s]]kill --session-id <ID>| --session-name <name or pattern> <PID> ... <PID n>`

- VBoxManage: added support for watching guest sessions via `guestcontrol watch`

- VBoxManage: added `modifyvm --triplefaultreset` to make the VM reset on triple fault instead of triggering a Guru Meditation (see )

- 3D support: several fixes

- 3D support: several fixes for Mac OS X hosts

- OVF: several fixes

- Extpack Installer: make it work if the file is located in a folder with special characters

- Keyboard: fix for reporting key sequences like Ctrl+Alt+Del for the USB keyboard emulation

- Shared Clipboard/X11: support for BMP-format images, contributed by François Revol

- Mac OS X hosts: limited support for Mac OS X 10.9 (Mavericks)

- Mac OS X hosts: use a launchd script instead of the deprecated StartupItem mechanism (bug #8940)

- Windows hosts: don't cause massive DPC latency (only on certain hosts; still needs improving; bug #6242)

- Windows hosts: consider symlinks when retrieving volume information (bug #11962)

- Windows hosts: fixed an issue with USB2 devices being inaccessible when plugged into USB 3.0 ports

- Windows Additions: fixed misbehavior with guest display power management (WDDM driver only; bug #11170)

- Windows Additions: fixed memory leak caused by WTSQuerySessionInformation() on Windows 2000 guests (bug #12072)

- Windows Additions: ability to track guest user idle times through the newly introduced event IGuestUserStateChangedEvent

- Linux Additions: fixed udev detection in the init script with Linux 3.x kernels