My source files are 320kbps MP3's. When I convert them to either AAC (Nero) or MP3 (Lame) in order to make them fully iTunes compatible (integrated album art, replay gain, and lower the KBPS), the resulting Album Artist field contains a duplicate of the source file entry, separated by a semi-colon.

A similar conversion but from FLAC files does not cause any issues.

Thank you.