Have had similar experiences with AB presets. Scene changes in editor that don’t “stick”, presets that are in the unit but showed as EMPTY on preset manager... there’s something weird there but can’t put the finger exactly on the cause/effect chain. Maybe it has something to do with the CS assigned to amp controls? The unit sounds terrific but this issue should be addressedI've recently started using FM3 Edit in anger, in order to tweak some of Austin Buddy's Gold presets into band ready presets. I am experiencing a lot of freezes using the editor. Yesterday I was finding that the editor seemed to be working but sometimes when I went to the preset list to select a different preset nothing would happen. The list would come up, and allow me to click on the preset I wanted to go to but the preset wouldn't change. I would then try to pause the editor and it wouldn't pause either. I noticed I could still say, edit the delay block or the amp block, but not select a different preset. When I rebooted the FM3, it would boot up on the preset I had tried to select in the editor.
I still haven't had a freeze when NOT connected to FM3 edit.