I get the message "You can't open the application iPhoto because it may be damaged or incomplete." This is a currently support iPhoto'11. Purchased and installed prior to OS X Lion upgrade. Was working, and now it is not. What might have happened? I saw that Apple updated iPhoto in the App Store, but that is not where I purchased this. I tried Software Update, but it said all the software was up to date.
Do you have iLife '11 Discs or did you download it from the App Store?