Edit mode causing screen trouble/computer freeze

When I am in iPhoto edit mode, inevitably at some point one or both of these will happen - the monitor screen will begin "mosaicing", starting with small color blocks in random places, and spreading over the entire screen. Sometimes everything freezes and I cannot move or shut down or activate anything, and in either case, I have to do an emergency shut down with the back button - upon restart everything is functioning properly again. The most recent episode, however, took 3 attempts to shut down the mac this way. AppleCare had me do all software updates and a permissions repair from the start-up disc, but this is still happening. Any ideas? Thanks -

Well that's another perfectly good theory ruined by facts!
Try create a new account (systempreferences -> accounts) and see if the problem is repeated there. If it is, then a re-install of the app might be indicated. If it's not, then it's likely the app is okay and the problem is something in the main account.
Regards
TD

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