Apple has pushed an update for Aperture down through Software Update.
This update supports general compatibility issues, and also addresses overall stability and performance. Minor issues addressed include the following:
Improves reliability and performance when syncing web-published albums
Slideshow exports are now handled as a background operation
Crop tool now correctly supports use of gestures to define crop size
Gesture support can now be enabled or disabled in Preferences
Fixes an issue that could cause a blank sheet to display when placing a book or print order
Published MobileMe, Facebook and Flickr albums now appear in a Web section in the Projects Inspector
Shift-clicking snapshots on the Faces corkboard now allows you to make contiguous selections
Metadata presets are now correctly applied to imported audio files
Fixes an issue that could cause Aperture to quit unexpectedly when trimming audio in full screen mode
Resolves various issues when adding names to Faces using accented, Japanese, Korean or Simplified Chinese characters
Improves stability when browsing video clips
Addresses reliability of library repair and rebuild
The update is recommended for all users of Aperture 3.
For detailed information on this update, please visit this website: http://support.apple.com/kb/TS2518