Here is what I found...
For a new Performance in Rig Manager (one that has been initialized and just has “Crunch” listed.
I double click the the Performance (MyProfiler) to select it, you will see the headphone symbol showing that it’s is selected.
Go into Rigs (MyProfiler), highlight a rig and either right click (copy) or use Edit drop down (copy).
Go back to Performance (MyProfiler) and now try to “paste” the rig into the #1 performance slot... nothing happens.
Now if I then click/select #2 performance and then click/select #1 performance again, I can now “paste” the rig into the #1 performance slot.
For some reason the first slot does not become active unless you first choose a different performance slot first. After I do this, everything works as it should, all rigs/performances appear as edited on my Kemper as I had within Rig Manager.