I keep having a problem where Finder freezes up during normal operations, whether it's moving a file from one location to another, renaming a file, emptying the trash, etc. It's very random as to when it happens. It refuses to relaunch and Mac OS X will not even shut down. It will try to shut down by closing open applications, but then never actually shut down. I have to force a shut down by holding down the power button. It's happened to me maybe 4 or 5 times in the last few days since I upgraded. Is anyone else having this problem or know how to fix it?