This exact thing happened to me (I had KBUR through Marketplace and upgraded). It was reported and discussed here too…
I contacted Orbx who suggested I write a Zendesk ticket, and surprisingly, whatever happened was resolved over the weekend for the people on that thread. If you’re still having the problem after re-downloading the airport through Content Manager, then I imagine you’ll need to write another ticket.
But to add another suggestion, I think most of us on that thread actually deinstalled the airport then reinstalled it. If you haven’t tried that, give that a shot. If you have, then sorry, best of luck.