I had this same problem recently when everything has been running fine. My simulator just started crashing every time I would load a flight. Also, some airports wouldn't show up when I'd try to enter them into any GPS. I thought it was caused by a recent Navigraph or Simlink update, but updating or uninstalling didn't help. Then I thought it was Carenado's Synthetic Vision, because I suddenly got the NO LIC displaying on all Carenado G1000 aircraft. That issue was caused by the Windows Defender Update which autodeleted some files it thought was a threat. That happened to EZDOK before, so I already knew how to fix it by adding exclusions to the proper folders and reinstalling Synthetic Vision. Then I resorted to running the Orbx Vector configurator, and that seems to have fixed my problem. If you have Orbx Vector, I suggest you run the configurator, apply the settings, and try again.