I applied the 1.0.0.2 update this afternoon, and upon restarting I was greeted with empty black screens on the GTNs. Nothing else changed, I had been flying just minutes before.
Solution: Go to your ...X-Plane 12\Resources\plugins folder and you'll now see two similar sub-folders: TDS-GTNXi with an older date and TDSGTNXi with today's date or when you updated to 1.0.0.2. The later one is correct, and the TDS-GTNXi (with the hyphen) is a fossil from the older version. Delete it, leaving only the TDSGTNXi folder. Stop and restart X-Plane. You should now see the normal startup screen in the two GTN units.
After doing this I had a problem where as soon as clicked Continue, the #1 unit started flashing between screens and would not start up. I was able to start the #2 unit normally. Then I killed X-Plane again and restarted. This time both units started normally and as far as I can tell all is OK.
Solution: Go to your ...X-Plane 12\Resources\plugins folder and you'll now see two similar sub-folders: TDS-GTNXi with an older date and TDSGTNXi with today's date or when you updated to 1.0.0.2. The later one is correct, and the TDS-GTNXi (with the hyphen) is a fossil from the older version. Delete it, leaving only the TDSGTNXi folder. Stop and restart X-Plane. You should now see the normal startup screen in the two GTN units.
After doing this I had a problem where as soon as clicked Continue, the #1 unit started flashing between screens and would not start up. I was able to start the #2 unit normally. Then I killed X-Plane again and restarted. This time both units started normally and as far as I can tell all is OK.
CH-47D X-Plane