Picard 1.3.1 crashes on some OS X systems on start. No useful console output:
Family-iMac:MacOS John$ ./MusicBrainz\ Picard --debug
Illegal instruction: 4
Looks like some library incompatibility, see attached crash report.
Reported on http://forums.musicbrainz.org/viewtopic.php?pid=29049#p29049 (new issue at the bottom, not the config upgrade error originally reported there)