Hey guys. I just upgraded to Leopard from Tiger and I've been pretty disappointed with the results. I did a standard upgrade and I found Leopard's performance very sluggish in comparison to Tiger. The big problem I'm having right now is that I can't quit all my apps. When I go to quit an app, the app disappears, but it still shows as being open in the dock. I try to force quit it, and nothing happens. I can't relaunch the app either. I have to wait until I reboot before it'll work again. This happens with Safari, Mail, and other apps too. Apps like TextEdit, Transmit and Preview close fine though. Any ideas what's happening here? This is very annoying.