For details, see: http://forums.musicbrainz.org/viewtopic.php?pid=13412 Steps to reproduce: You are on the "tracklist" page Hit "add disk" Enter a disc information in disc 2 Delete disc 1 You should have a single disc, it will be labeled as disc 1 Hit "next>>" to "recordings" page Hit "<<previous" to "tracklist" You now have an empty disc 0, and your disk is labeled disc 1