Expose, hot corners and an MBP

Curious as to whether this is systemic or specific to my setup -
I use hot corners for Expose and Dashboard, top left and lower left, respectively.
On all my other Macs, cursor in the top left deploys or hides Expose, on my MBP it only deploys; Dashboard opens and closes like it's supposed to.
Any ideas??
Z

Early yet, but it looks like this is related to the last system update.
I started from my backup drive (10.4.6) and Expose worked properly. I ran a slew of updates to get it current and Expose still works fine; version of 10.4.7 is 8J2135a. Restarted on main drive and checked - 8J2135. I have run and re-run the combo updater and still have 8J2135 on my main drive. If I can get 8J2135a to load, I expect Expose to work again properly.
Z

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                                click
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                        end repeat
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                end tell
                click button "OK"
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        end tell
    end tell
    quit
end tell

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Hi,
I really like the hot corners and exposé, but sometimes it's annoying that they activate exposé accidently while moving around the screen. Is it possible to delay the activation a little bit so that they react only if the mouse is 'staining' there and not when just 'touching' them for milliseconds?
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