I experienced freeze on boot, no output, disappearing blocks in FM9 Edit, and a slow/hung editor with beta installed. Just got firmware V1 back on the FM9, so far so good, but I haven't had long to power cycle or edit much yet.
I lost whatever presets I had created or tweaked since installing beta, and they won't load on the old firmware as far as I can tell.
I've been happily using an Ultra for so long, I'm going to have to put some thought into how best to handle firmware updates going forward. I'd rather not recreate them constantly if I can help it. Maybe it's not such an issue going forward that it is reverting backwards?
Still sounds killer on FW1 BTW!