I've had several people report that deleting playlists causes intermittent hanging on the Karma. I emailed this in to the Rio Team to see if they've seen this also. I don't know if this is only an RMML/jEmplode issue or if RMM over Ethernet has similar problems. It seems to be made worse if you try to do things on the Karma while deleting playlists, but it sometimes hangs even when nothing is going on. This could definitely be something I'm doing wrong, but even if it is, there shouldn't be a way to hang the Karma.