Before upgrading to 2.5.1 (on Windows XP), I began getting null warnings when trying to run Autocorrect. At the final fault, it renamed one of my mp3s as a temp file before crashing.
After installing the new version, it's still having trouble. In the console, I get this message:
Aug 8, 2008 7:06:06 PM: SEVERE: There was a problem submitting a query to MusicBrainz for Record Number 0 with filename temp33148.mp3: null