I second #115.  This appears to be related to alt+tab switcher. On my 
installation(11.04) this bug is reproducible 100% of times.
0. Start with fresh instance of compiz (compiz --replace).
1. On any workspace, have at least 2 windows.
2. Alt+Tab and select any window.
3. The dead zone bug appears where the alt+tab switch view was present and no 
buttons/ui interactions can be made in that area.

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https://bugs.launchpad.net/bugs/709461

Title:
  Application windows can sometimes fail to display and will mask
  regions of the screen

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