I've been getting these a lot lately, also. Using each of two different libraries: one with a large music archive and 30+ podcasts, and another with a few hundred videos. It actually started when I was using Version 14, and now I'm using the v15 trial. I started with 15.0.113, then updated it to 15.0.122 and tonight grabbed the 15.0.124 you posted. I'm on XP MCE SP3.
The music library I leave open (but not playing or doing anything) most of the time, and often find it has crashed upon returning to my desk. The crashes rarely occur when I'm using the library. Often it crashes overnight.
I just started the new video library this weekend and have been tagging files with the Wikipedia lookup. It works fine for a while if I've left it alone for a while, but after the first crash, I get pretty quick and frequent crashes upon going back in and trying to update more files. When I installed ver .124 it worked fine for quite a while without crashing, but just went down again. There doesn't appear to be a specific action that triggers it. Sometimes it is tagging a file, sometimes it's selecting a file.
I'll send you a log file.