afflicts my system also.
I notice if you dont move on to another task, and keep trying the menu, it 
eventually pops open properly.
logging out does fix it.

Here is a thread with screen shots showing it happening
http://ubuntuforums.org/showthread.php?p=10502127#post10502127

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in ubuntu.
https://bugs.launchpad.net/bugs/718712

Title:
  MENU REMNANTS CORRUPT SCREEN

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