If you are a VirtualBox user and are running OS X Mountain Lion on your Apple Mac, do not install OS X 10.8.2. After the update, VirtualBox will no longer be able to run virtual machines.
There is some fundamental change in the way that OS X 10.8.2 works that is not compatible with VirtualBox and it stops with an error that only one VT-x hypervisor can be running at once. Apparently Mountain Lion already uses this and so VirtualBox can't. It tries to start the virtual machine, but it hangs and you have to force quit it. The obvious thing to do is to turn off VT-x/AMD-V in VirtualBox settings, but this completely crashed my Mac and I had to hold down the power button until it switched off.
Fortunately, there has just been an update to VirtualBox and v4.2.1 should fix the problem. From reading the thread on the VirtualBox forum, it appears that it doesn't fix it for everyone though. Use the uninstaller that comes with VirtualBox and then reboot the Mac. Download the new version and extensions and install it. If it still doesn't work you'll just have to wait for a bug fix from Apple or VirtualBox.
Thankfully I installed Mountain Lion on a separate partition so I can still boot into Lion.
Wednesday, 10 October 2012
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