I recently made a program go off the dock so that it doesn't bother me, and I also played with some SSH settings in /etc/sshd_config and /etc/services (specifically, the ones mentioned in Rule #4 of Mac Geekery's Basic Mac OS X Security article) and now my computer won't shut down, saying that Finder won't quit. However, the little white arrow is not below the Finder icon in the Dock. Also my desktop items and top menu disappear. Once the "Logout timed out because Finder failed to quit" window pops up, I reopen finder from the Dock and everything comes back. I have tried manually quitting the hidden server application before shutdown, so I don't think it is that. By the way it is a Mac Book running OS X 10.5.4 which i bought new last august.