VirtualBox 4.2.12 Build 84980

What's new in this version:

- VMM: fixed a Guru Meditation on putting Linux guest CPU online if nested paging is disabled
- VMM: invalidate TLB entries even for non-present pages
- GUI: Multi-screen support: fixed a crash on visual-mode change
- GUI: Multi-screen support: disabled guest-screens should now remain disabled on visualmode change
- GUI: Multi-screen support: handle host/guest screen plugging/unplugging in different
- visual-modes
- GUI: Multi-screen support: seamless mode: fixed a bug when empty seamless screens were represented by fullscreen windows
- GUI: VM manager: vertical scroll-bars should be now updated on content/window resize
- GUI: VM settings: fixed crash on machine state-change event
- GUI: don’t show warnings about enabled or disabled mouse integration if the VM was
- restored from a saved state
- Virtio-net: properly announce that the guest has to handle partial TCP checksums
- Storage: Fixed incorrect alignment of VDI images causing disk size changes when using
- snapshots
- Audio: fixed broken ALSA & PulseAudio on some Linux hosts due to invalid symbol resolution
- PS/2 keyboard: re-apply keyboard repeat delay and rate after a VM was restored from a saved state
- BIOS: updated DMI processor information table (type 4): corrected L1 & L2 cache table
- handles
- VBoxManage: don’t stay paused after a snapshot was created and the VM was running
- before
- VBoxManage: introduced controlvm nicpromisc
- VBoxManage: don’t crash on controlvm guestmemoryballoon of the VM isn’t running
- VBoxHeadless: don’t filter guest property events as this would affect all clients
- Guest control: prevent double CR in the output generated by guest commands and do NLS conversion
- Windows Additions: Support for multimonitor. Dynamic enable/disable of secondary virtual monitors. Support for XPDM/WDDM based guests