I don't know how to reproduce this bug, but it seems  coming after play games 
who needs a huge amount of graphic power or if I'm working on a lot of open 
windows.
I have this bug with "nouveau" driver or "nividia" driver.

When it happens, i do a:

compiz --replace

and everything come back to normal.

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https://bugs.launchpad.net/bugs/735162

Title:
  menu application appears behind window application

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