Unfortunately in subsequent flights when NOT using SU10 navdata it was not loading again, and restart was required.
The program was still running afaik. the box in the toolbar is white. The menu opens but gets stuck on loading. I always open GSX using a hotkey.
Fixing it requires closing the app in the toolbar then starting COUATL using the 'start couatl' .exe
Could it be that the issue is that the program remains active (white icon in toolbar) during the flight?