Same thing here.
I've spent the last 2 hours trying to create a new performance. No luck
Kemper crashed probably 7/8 times. Had to delete the performance in Kemper to stop it from crashing.
When creating a new performance rigs would switch slots.
Rigs would revert back to crunch.
Dragging presets into rigs would work some times.
Could not save changes in RM. Orange save would be grayed out.
I would be starting at rig manager showing me one thing and kemper showing a different thing.
Very frustrating experience so far.
I've had better luck creating/saving performances with the chickenhead knob in Browse mode