Expose occasionally doesn't work

I have a MacBook Pro 15" latest series running Snow Leopard. Occasionally (pretty often), Expose doesn't work. I have Expose enabled and have made corners of my screen sensitive. The corners don't respond and neither does the Expose button on my keyboard.
Dashboard, which is also triggered by one of the screen corners does work.
I connect and disconnect my MacBook from an external monitor about twice a day. About an hour ago everything worked fine but now (nothing changed in the hardware setup) it doesn't work anymore.
Does anyone have any idea what may cause this and how I can fix it. I love Expose and it's natural for me to use it by moving to any of the screen corners.

I have the same problem only it happens regardless which monitor I use, macbook display or external monitor. Also If I hide my dock it will not come back either. I had to turn off hiding my dock which reduces my max window size. I have my upper right corner set to show all windows and I have become very dependent on that feature. Not having expose is very frustrating!

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