Did you ever figure out your issue?
I had the same problem in the Cirrus this afternoon. I put a flight plan into the World map, it didn’t show up in the GPS in any screen, the flight plan was blank, and it wouldn’t let me enter a flight plan. It also didn’t let me access all the map pages it seemed.
Normally I fly without a flight plan, and I’ve had no issue adding one once I was in the plane and it worked as desired.
I have the Marketplace NXi installed, and I also still have the PMS50 530 installed. I don’t have the Marketplace WT530 installed. I haven’t tried uninstalling the PMS50 yet.