I ran V2.49 installed in a separate directory from V2.44, and upon reverting to V2.44 found that my references to BAND had been replaced by references to ALBUMARTIST.
Bad. Mp3tag should not secretly interefere with use settings thus.
I guess this is a design decision in connection with http://www.mp3tag.de/en/changelog.html .
[2010-10-13] CHG: renamed field name BAND to ALBUMARTIST
But a poor one.
I suggest this behaviour be removed or at least made optional, failing which a warning be given to the user.