I have had this problem too with CF. I beleive it comes from the refresh /speed problems he had with 1.5. If CF locks up on you if you hibernate and come back it will be a black screen and music will probably still keep playing. My suggestion if you havn't done so already is install the remote power button switch on your M1-ATX so you can power down your system and back up. I have had pretty good luck at times keeping CF from locking up on me however one it locks up it seems to like to lock up several times afterwards.