Symptoms
After upgrade to OS X Mountain Lion a Virtual Machine in Fullscreen mode flickers frequently. This issue occurs only if a second display connected to your Mac computer
Cause
This OS X issue occurs on ATI 6xxx video card on OS X Mountain Lion only.Solution
Download and install the latest OS X 10.8.1 update: click on Apple logo > Software update... and install the updateIf the issue still persists
Disconnect the second display from MacWorkaround 2
Disable 3D acceleration in your Virtual Machine:- Virtual Machine menu > Configure... > Hardware > Video > check off Enable 3D acceleration
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