A few times since I've upgraded to 2.0b7, my left front speaker has had no sound coming from it when the empeg comes up. Playing with the balance and fader doesn't help. Nudging the empeg in its sled doesn't help. Holding down the upper button to turn it off and turning it back on *does* fix it (in the two or three times it's happened). I don't think it's a problem with my amp or with the wiring because of what seems to fix it. I didn't see this problem prior to 2.0b7, but I only ran 2.0b3 for about a week, so it's possible that it may have existed there, too. The sound might also not be coming from another speaker. The next time it happens (if it does), I'll double-check that.