VirtualBox 4.1.20 released

I run VirtualBox on my desktop for testing purpose. Sometimes for fun.
As Oracle releases VirtualBox 4.1.20 one week ago. I received the update notice when I double clicked the icon.
Here is the change lists.
VirtualBox 4.1.20 (released 2012-08-20)
This is a maintenance release. The following items were fixed and/or added:
VMM: fixed a crash under rare circumstances for VMs running without hardware virtualization
VMM: fixed a code analysis bug for certain displacement instructions for VMs running without hardware virtualization
VMM: fixed an interpretion bug for TPR read instructions under rare conditions (AMD-V only)
Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bugs #9604, #10491)
VBoxSVC: be more tolerant against environment variables with strange encodings (bug #8780)
VGA: fixed wrong access check which might cause a crash under certain conditions
NAT: final fix for crashes under rare conditions (bug #10513)
Virtio-net: fixed the problem with receiving of GSO packets in Windows XP guests causing packet loss in host-to-VM transfers
HPET: several fixes (bugs #10170, #10306)
Clipboard: disable the clipboard by default for new VMs
BIOS: the PCI BIOS was not properly detected with the chipset type set to ICH9 (bugs #9301, #10327)
Mac OS X hosts: adaptions to Mountain Lion
Linux Installer: fixes for Gentoo Linux (bug #10642)
Linux guests: fixed mouse integration on Fedora 17 guests (bug #2306)
Linux Additions: compile fixes for RHEL/CentOS 6.3 (bug #10756)
Linux Additions: compile fixes for Linux 3.5-rc1 and Linux 3.6-rc1 (bug #10709)
Solaris host: fixed a guru meditation while allocating large pages (bug #10600)
Solaris host: fixed possible kernel panics while freeing memory
Solaris Installer: fixed missing icon for menu and desktop shortcuts

I have Dos 6.22, Windows XP, Centos 6, Windows 8, running inside of VirtualBox.
The performance is good. I believe VirtualBox is the best OpenSource virtual platform so far.
Click here to download VirtualBox 4.1.20