... released about 12 hours after beta 7 -- the nasty "blank columns" bug and the even nastier "stops scanning songs after a few minutes" bug are fixed.
There still exists one longstanding crashing bug that I now know of in beta 8 (in [AMGInterface amgAlbumsWithSong:] for those of you who look at your crash reports), but after that I think it's time to stop calling it a beta.