I've started getting this error message at the splash screen also. I'm not too concerned about it - just want to report the message, as PM seems to function without any problem after I click ok. I don't have to kill the app on exit though. Win XP SP2, 2GB RAM, PM 4.5.2. I recently covered an event where I had about 10,000 photos sprerad over 5 folders and my system locked up when browsing one of the folders in PM. Since then I've been getting the message. I tried setting the prefs to clear the cache on exit, and then turned caching back on, but still get the error.
Vincent