Command - Tab shortcut not working

My command - tab shortcut stops working after a random period of time and I have to restart my MacBook to get it working again. Any idea what could be causing this keyboard shortcut to fail? I tried killing and re-running the Dock but that does not fix it. A refuse to reboot my Mac everytime it happens (this is not Windows...) Any ideas on what might be causing the problem?

Actually I just researched this further and found a solution here:
http://discussions.apple.com/thread.jspa?threadID=1830738&tstart=0
+Open the activity monitor and look for something like the "ScreenSaverEngine" - the process should be marked as "not responding" (written in red)+
+End this process and Command+Tab and other shortcuts will work again!+

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