Changelog for VirtualBox 4.0
VirtualBox 4.0.10 (released 2011-06-27)

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

GUI: fixed disappearing settings widgets on KDE hosts (bug #6809)
Storage: fixed hang under rare circumstances with flat VMDK images
Storage: a saved VM could not be restored under certain circumstances after the host kernel was updated (bug #8983)
Storage: refuse to create a medium with an invalid variant (for example Split2G with VDI; bug #7227)
Snapshots: none of the hard disk attachments must be attached to another VM in normal mode when creating a snapshot
USB: fixed occasional VM hangs with SMP guests (bug #4580)
USB: proper device detection on RHEL/OEL/CentOS 5 guests (partial fix for bug #8978)
ACPI: force the ACPI timer to return monotonic values for improve behavior with SMP Linux guests (bug #8511 and others)
RDP: fixed screen corruption under rare circumstances (bug #8977)
rdesktop-vrdp: updated to version 1.7.0
OVF: under rare circumstances some data at the end of a VMDK file was not written during export
Mac OS X hosts: Lion fixes (bug #8903)
Mac OS X hosts: GNOME 3 fix
Linux hosts: fixed VT-x detection on Linux 3.0 hosts (bug #9071)
Linux hosts: fixed Python 2.7 bindings in the universal Linux binaries
Windows hosts: fixed leak of thread and process handles
Windows Additions: fixed bug when determining the extended version of the Guest Additions (4.0.8 regression; bug #8948)
Solaris Additions: fixed installation to 64-bit Solaris 10u9 guests (4.0.8 regression)
Linux Additions: RHEL6.1/OL6.1 compile fix
Linux Additions: fixed a memory leak during VBoxManage guestcontrol execute (bug #9068)