http://www.macnn.com/articles/08/07/29/aperture.211.update/
Aperture 2.1.1 adds stability, compatibility, more
updated 01:05 am EDT, Tue July 29, 2008
Aperture 2.1.1 update
Apple on Monday released Aperture 2..1.1, an update to its photograph organization and manipulation utility for Mac OS X. The update supports general compatibility issues, improves overall stability, and addresses a number of other minor issues. It is available via Mac OS X update or via the Web as a download (48MB). It requires Mac OS X 10.4.11 or later.
Fresh-Faced Recruit
Joined: Dec 2005
Possible problems...
Actually, I think it made my version of aperture a little less stable. Feel free to comment on my discussion question here:
http://discussions.apple.com/thread.jspa?threadID=1637106&tstart=0