Apple Aperture 3.1.1 is now available. This update addresses overall stability and performance issues, and also includes specific fixes that:
1. address compatibility with the iLife Media Browser
2. improve reliability when upgrading existing Aperture libraries
3. address issues with publishing photos to MobileMe, Facebook and Flickr
The update is recommended for all users of Aperture 3.
For detailed information on this update, please visit this website: support.apple.com/kb/TS2518