I played with the Karma for a while, including updating the firmware, and then gave it to my wife to play with for a few days. She was initially pleased, then got rather upset. "Can't upload, keeps restarting".

After a little while we figured out it was her "weird" songs with those pesky non-US-ASCII tags in them Fetching a copy of the "unreleased" rmm lite jarfile from mschrag's site fixed her problem, and she's much happier now.