VirtualBox 4.2.2 Build 81494

What's new in this version:

The following items were fixed and/or added:
- VMM: adapted to changes in Mac OS X 10.8.2 
- GUI: restored VM item tool-tip functionality (4.2 regression)
- GUI: added group item tool-tip functionality
- GUI: fixed handling of the .ova/.ovf file name association (4.2 regression)
- GUI: it was not possible to change any setting before the first VM was created 
- GUI: disable grouping action if all the selected items are full children list of the same group already
- GUI: added menu for runtime drag-and-drop option change
- GUI: cleanup shared-clipboard menu on visual-mode change
- GUI: make sure VM receives keyboard focus on entering fullscreen-mode on Win host 
- GUI: disable proxy authentication for security reasons
- 3D Support: DrawIndexedPrimitiveUP implementation fixes for the Windows WDDM video driver 
- Storage: fixed a release assertion in the AHCI emulation when requests where canceled with asynchronous I/O disabled
- Storage: fixed a hang during VM reset under certain circumstances 
- NAT: fixed a crash under rare circumstances (Windows hosts only)
- NAT: automatically use the host resolver if the host name server is set to some unusual loopback value 
- E1000: fixed a VirtualBox crash during intensive network transfers (4.2 regression)
- ICH9: fixed PCI bridge initialization
- USB mouse: ensure that the last mouse event doesn't get lost if no URBs are available
- BIOS: certain legacy guests (e.g. Windows 95) didn't find the boot device after a warm reboot
- BIOS: don't trash the palette in text modes when setting the border color
- EFI: fixed OS X guest autoboot (4.2 regression)
- VBoxManage: fixed output of showvminfo --machinereadable 
- VBoxManage: fixed parsing of storageattach --discard 
- VBoxManage: fixed wrong output of the HPET setting in showvminfo 
- VBoxManage: fixed closing the guest session after executing a guest process via guest control
- VBoxShell: adaptions to interface name changes
- Guest Additions device: fixed a Guest Additions hang when a machine was reset after a crash
- Linux hosts / guests: Linux 3.7-rc1 fixes
- Linux Additions: support X.Org Server 1.13
- Linux Additions: fixed a hang when the X server was restarted with old guest kernels
- Linux Additions: fixed a VBoxService crash during CPU hot remove 
- Windows Additions: fixed automatic screen resize issue for NT4 guests
- OS/2 Additions: fixed shutdown hang
- OS/2 Additions: fixed mouse driver panic
- Solaris hosts: fixed autostart service going into maintenance mode after all VMs started
- Solaris hosts: fixed linking the host driver with the dtrace module