I have an imac g4 1 GHz. I still have Panther although I'm going to upgrade to Tiger: I've already ordered it. I just used disk utility to repair permissions for the first time (I'm trying to get on board with these things). Once it was done, I opened iPhoto but the program kept saying "Loading Photos" for about 20 minutes but never found the photos. I'm not sure what happened. My photos are still there in the library when I searched for them in the Finder. Any ideas?
Did you restart your computer after correcting permissions? (Important: Always restart after fixing permissions...) - I'd fix them again and restart right after it, if you didn't do that the first time.