Lightroom 2.2 is buggier than hell. Upgrade at your own risk. I'm going back to 2.1 until they figure it out. After installing it today I found that I couldn't export any photos. I got online at the Adobe support forums, and figured out how to fix that. LR2.1 would lock up on me because of the memory leak bug, but when I restarted LR I'd only lost my last 2 or 3 development changes. LR2.2 just locked up on me (seemed like the memory leak again), and when I restarted it I'd lost all my changes from the last hour of work. Folks are bitching up a storm at the Adobe support forum.