Lightroom crashing

I updated my OSX to 10.7.3 a few weeks ago and since then I've had about a dozen crashes in Adobe Lightroom 3.0. Serious enough to bring the entire program down and generate giant error report files 'to be sent to Apple'. Once it even lost track of my entire catalogue.

Anyone else having these? Is there a fix?

I have an early 2011 MBP with a 2.3 ghz i7 and 4 gig ram

Verify your disk and your file permissions. There may be a corruption in either. I had an issue like that last week in Final Cut Pro X, but once I did that, it was fixed.