After the latest iPhoto update to Version 9.3 i experienced a reproducable crash of iPhoto.
This was the error i found in the Crah-Report.
Library not loaded: /System/Library/PrivateFrameworks/CoreMediaIOServices.framework/Versions/A/CoreMediaIOServices
After some time i found some solution in the apple support forums.
You just need to restore the folder /System/Library/PrivateFrameworks/CoreMediaIOServices.framework from your latest backup.
I really wounder what happened to apples QA. I mean thats the second update (after the thunderbolt 1.2 update), that affect other software or the system stability itself.