I was in the middle of changing the artist on the tracks on this release (http://musicbrainz.org/release/6ade6c96-fffa-49a8-acba-bc3513258c73) when my browser started to hang before I could change the last 4 tracks. I closed the browser and changed the last 4 tracks in another edit.

Now I see that it has deleted all but the first 4 tracks.