Active screen corners suddenly quits for no reason

Friends,
Active screen corners sometimes suddenly quits on me for no reason. I'm breezing along, doing my thing and periodically moving the mouse to one corner to "show desktop" or another to show "all windows." Suddenly, moving the mouse to the corner does nothing. I can't predict when this will occur. Restarting solves the problem.
Any ideas?
Thanks!
Steve

Are you using an external monitor, but not all the time? I get the exact same behavior sometimes when I disconnect my MacBook Pro from my external monitor and then try to activate Expose using active screen corners. It simply doesn't work. However, if I restart, everything works just fine because Leopard recognizes my laptop screen as the primary display. Seems like a bug to me, but I'm not sure. I'd like to hear from others who may know more about the issue.
Message was edited by: Joshua Kaufman

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