= Changelog for VirtualBox 4.2 = This page lists all changes of the !VirtualBox 4.1 '''[wiki:Download_Old_Builds_4_1 releases]'''.[[BR]] All branches: [wiki:Changelog 4.2] · [wiki:Changelog-4.1 4.1] · [wiki:Changelog-4.0 4.0] · [wiki:Changelog-3.2 3.2] · [wiki:Changelog-3.1 3.1] · [wiki:Changelog-3.0 3.0] · [wiki:Changelog-2.2 2.2] · [wiki:Changelog-2.1 2.1] · [wiki:Changelog-2.0 2.0] · [wiki:Changelog-1.6 1.6] '''!VirtualBox 4.2.0''' (released 2012-09-13)[[BR]][[BR]] This version is a major update. The following major new features were added: * Improved Windows 8 support, in particular many 3D-related fixes * GUI: VM groups (bug #288) * GUI: expert mode for wizards * GUI: allow to alter some settings during runtime * Support for up to 36 network cards, in combination with an ICH9 chipset configuration (bug #8805) * Resource control: added support for limiting network IO bandwidth; see the manual for more information (bug #3653) * Added possibility to start VMs during system boot on Linux, OS X and Solaris; see the manual for more information (bug #950) * Added experimental support for Drag'n'drop from the host to Linux guests. Support for more guests and for guest-to-host is planned. (bug #81) * Added support for parallel port passthrough on Windows hosts * Enhanced API for controlling the guest; please see the SDK reference and API documentation for more information In addition, the following items were fixed and/or added: * Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion * VMM: fixed a potential host crash triggered by shutting down a VM when another VM was running (only affected 32-bit hosts and 64-bit OS X hosts, 4.1 regression, bug #9897) * VMM: fixed a potential host crash under a high guest memory pressure (seen with Windows 8 guests) * VMM: improved VM context switch performance for Intel CPUs using nested paging * VMM: added support for ''FlushByASID'' features of AMD CPUs (Bulldozer and newer) * VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug #9941) * VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. old OS/2 releases) * VMM: support recent VIA CPUs (bug #10005) * VMM: fixed handling of task gates if VT-x/AMD-V is disabled * VMM: page fusion fixes * GUI: network operations manager * GUI: allow taking screenshots of the current VM window content (bug #5561) * GUI: allow automatically sorting of the VM list * GUI: allow starting of headless VMs from the GUI * GUI: allow reset, shutdown and power off from the Manager window * GUI: allow to globally limit the maximum screen resolution for guests * GUI: show the full medium part on hovering the list of recently used ISO images * GUI: do not create additional folders when a new machine has a separator character in its name (bug #6541) * GUI: don't crash on terminate if the settings dialog is still open (bug #9973) * GUI: consider scaled DPI values when display fonts on Windows hosts (bug #9864) * GUI: if a bridged network interface cannot be found, don't refuse to start the VM but allow the user to change the setting immediately (bug ) * Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs #9364, #9604, #10491) * Clipboard: disable the clipboard by default for new VMs (see the manual for more information). It can be enabled at any time using the VM menu. * Settings: sanitize the name of VM folders and settings file (bug #10549) * Settings: allow to store the iSCSI initiator secret encrypted * NAT: improvements for the built-in TFTP server (bugs #7385, #10286) * NAT: fixed memory leak when disabling the NAT engine (bug #10801) * E1000: 802.1q VLAN support (bug #10429) * Storage: implemented burning of audio CDs in passthrough mode * Storage: fixed audio CD passthrough for certain media players * Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images * Storage: added support for QED images * Storage: added support for QCOW (full support for v1 and readonly support for v2 images) * Storage: added readonly support for VHDX images * USB: don't crash if a USB device is plugged or unplugged when saving or loading the VM state (SMP guests only) * Solaris additions: added support for X.org Server 1.11 and 1.12 * Solaris additions: switched to using an in-kernel mouse driver * Windows hosts: no need to recreate host-only adapters after a VirtualBox update * Windows hosts: updated toolchain; make the source code compatible to VC 2010 and enable some security-related compiler options * Windows Additions: fixed memory leak in VBoxTray (bug #10808)