I whipped up a quick tracklist external to MBz, and then started adding it as a release.
After hitting Parse Tracks, and matching all of the artists (VA comp) to the release, I went back into the Track Parser to mass-change the song titles to lowercase. Realizing that this would probably completely screw up my artists, I cleared the parser field, and clicked 'Done'. Doing so cleared the tracklist anyways.
'Done' should not be bound to any action other than closing the track parser WITHOUT any other action.
'Parse Tracks' is the 'close and parse' button, after all.