F3, cmd+tab, and the dock all stop working at once-Major unknown bug

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Dec 15, 2008
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This happens from time to time, more often when I use AIM for mac... Basically, all of a sudden, the dock won't appear and gets stuck on whatever it was doing. Pressing F3 and cmd+tab do nothing, and to go to a different application I have to get the window out of the way; minimizing doesn't work.

When I click on shut down after this bug shows up, it removes the dock, desktop, etc, leaving just the wallpaper... but then it gets stuck. If I press the power button, I get a prompt if I want to shut down. And it won't shut down until I press and hold the power button to force a turnoff. I have no clue what's causing this.

Specs: 10.5.7 leopard, 2GHz intel core 2 duo, Macbook. Got it for christmas.
 

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