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Iphoto won't open after upgrade

Update:12-10Source: network consolidation
I upgraded iPhoto.  Now when I try to open the application, I get a message "the photo libray needs to be updated..."  The spinning circle appears for a while, indicating 'work going on.'  Then the application shuts down. 
I download photos to iPhoto and I can view photos in Aperture.

The Best Answer

Try the following:
1 - launch iPhoto with the Command+Option keys held down and rebuild the library.
2 - Run Option #4, Rebuild Database, followed by Option #1 if needed.