Anyone else have this problem? I get it periodically, usually when I've been using the computer a lot. I get the spinning beachball and the only way to stop it is to reboot. For some reason it then takes a dislike to that particular file and will keep freezing if I try to carry on working on it, also if I resave. If I leave the computer off for a day or so it seems to regain its temper. It's an iBook G4, 3 years old - I had it checked over last year and they said it was fine.