Task bar clicks to bring up apps dont work randomly (reboot is the only fix)..

Anyone else run into this?

I'm running Vista x64.. After awhile, say a week.. or maybe just 1

day.. frequently when i have say 4 explorer windows opened and grouped

in the task bar.. I can click on the group, but attempts to click on

an individual explorer session fail.. its not just explorer's that

have been minimized, pretty much anything that has more than 1 item

(grouped) wont let you click on any of the items.

Only fix is a reboot.

Cheers