At those who also had an issue with syncing performances between the Kemper and Rig Manager:
I had created a new performance in Rig Mgr. Whenever I loaded this performance in the Kemper, the Kemper crashed. I suspect that it was this performance, which created the sync issue between the Kemper and Rig Manager. I have now deleted this (corrupt) performance on the Kemper and Kemper and Rig Manager now run smoothly.