Even though I’m on Mac, I can confirm that this is happening with that also. I couldn’t get the rig manager to work. An Internet search led me to this thread. I tried the close and open again as suggested by ztones. It works then.
So, to get the rig manager to work, I have to select the new rig, click “Apply”, close GigPerformer, then reopen. Then it will work with the different controller.