Sam Spilsbury:  Are you looking for a surefire way to reproduce the mouse dead 
zone?  Because I can tell you exactly how to do it with the default settings 
for either the Ubuntu Classic or the default Ubuntu desktops.
1.   Log in.
2.  Open a terminal from the menu, and move it away from the center of the 
screen where the switcher will appear.  Make sure that it still has focus.
3.  Hold down Alt-Tab to activate and show the switcher.
4.  While the switcher is still visible move the mouse to a point right above 
the very bottom of the gray switcher window.  Within a pixel or two of the 
bottom is sufficient.
5.  Click there.  You will see that the desktop does not take focus, and the 
terminal window still has focus.  If you run xwininfo you can click at that 
location and you will see information about a window that you can't see, and 
that is definitely not the background nautilus window.

I have noticed that this happens with both the "Static Application
Switcher" and the "Application Switcher" compiz plugins, however it does
not happen with the other switcher plugins.  Perhaps because those do
not use override redirect windows?  It happens regardless of if you are
using the unity-window-decorator or the gtk-window-decorator.

Interestingly, if you repackage emerald with the current code from the
git repository (since the package from the natty repositories
segfaults), it is unaffected by this mouse dead zone bug.

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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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