Active Screen Corners stop working without complete restart

Since I installed Snow Leopard, I've noticed a problem with my active screen corners not working. I usually only completely restart once in a while, so I usually just shut the lid at night (or when I go anywhere). with 10.5, it used to be that active screen corners always worked when I did that, but since I installed Snow Leopard, active screen corners quit working. I have to completely restart to get them to start working again.
Is there a way to fix this, or is it a bug?
Thanks.

I tested this with a few system applications, if it helps anybody.
It also might be interesting to note that in all cases where expose won't trigger, the dock won't unhide by holding the mouse at the bottom of the screen either so long as any of the non-working applications are selected.
List of applications that also have this problem on my system:
Textedit
Activity Monitor
iChat
Calculator (Unlike the other applications, the active corners don't even work on this the first time)
List of applications tested that are NOT having this problem:
iTunes
Safari
Terminal
Mail
Address Book
Photo Booth
QuickTime
Automator.
Does anybody know if the applications that are not working have anything in common? Conversely, could anybody confirm that they are NOT experiencing this problem, and that it is specific to certain system configurations, or perhaps even my system?
Thanks in advance,
Kevin

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Message was edited by: Joshua Kaufman

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Active Screen Corners stop working without complete restart

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