Apple posted a small update to iPhoto. Version 9.3.1 specifically addresses an issue with the sunsetting of MobileMe, and also fixes a minor bug. MobileMe shut down on June 30th. The update can be acquired via Software Update utility or downloaded below.
What's New in Version 9.3.1
• Addresses a problem during the migration of albums from MobileMe Gallery that may cause photos to be moved from their original events into a new event called "From MobileMe"
• Fixes an issue that in rare cases could cause iPhoto to hang when upgrading libraries
Apple