@Daerik thanks, I'll give that a try
@Shepardus @vaa44 I'm on 2.5.1.4, wasn't aware of the continuation past that.
The initial problem is fixed now, but there's a new one. The songs sound perfect on the first playback, but as soon as they start looping something goes horribly wrong. The volume of some instruments is almost down to zero, and others get horrifically desynced from the rest of the song.