Yesterday afternoon I installed the upgrade using the iMac OSX upgrade system. It downloaded and installed after two automatic reboots. I figured all was well until I rebooted the iMac and it hung at the light blue screen for about 5 to 9 minutes then finally showed the login screen. I am just about petrified to reboot again. I think I should repair permissions just to be safe before rebooting. What do you all think?