I have the same problem. It is not the problem of application hangs.

My problem:
I have firefox and terminal opened. But when i press alt+tab, I can only see 
firefox icon. but not terminal icon. The same happened when using Midori 
browser. But, i can use the applications by clicking it on the launcher. As the 
application is working well when clicking its icon on launcher, the application 
did not crash. It is the problem with unity.

I have this problem in 12.04 beta. I've never faced this broblem in
11.10.

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https://bugs.launchpad.net/bugs/13590

Title:
  Screen not properly repainting after attempted Alt+Tab between
  applications.

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