Exposé and now gestures just stop working?!?

Hi everyone,
   So I had this issue in Snow Leopard where occasionally, in the middle of the day, Exposé, Spaces, and my Hot Corners would just stop working for no apparent reason.  Seems to always occur after I return from lunch.
   Well, today I upgraded to Lion, and this afternoon am having the same issue, only this time more pronounced.  Absolutely NONE of my Magic Trackpad gestures are working now.  They do work within applications, but I can not invoke Mission Control, Exposé, Launch Pad, or desktop switching from my Magoc Trackpad.  I do not have this same issue with my home machine, (a same - generation 8-Core Mac Pro).
   I should add that the trackpad is a recent purchase (just this past Friday), but the seemingly identical (SL) Exposé issue was presenting itself long before. 
Any thoughts?

Really?  Nothing?  C'mon guys... I can't be the only one to be having this issue...

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