Found another issue...
When you have 2 windows open (as you have to to bring rigs into a performance), the performance slot details (i.e. the FX chain) doesn't change when you navigate to other performance slots.
I'm connected directly to the Kemper, no USB bus or adapters etc. involved.
Annoyingly, think I'm going to have to revert to the last stable release - finding lots of issues (which is to be expected, after all), but it's slowing down my workflow drastically. Just concerned that - last time I did this - I lost ALL rigs and performances, and the backup wouldn't load....
Right mouse-button: "Preview in Profiler" should work.