Hi Jan
I am sure that something went wrong with the steam update, the idea of corrupted files. Today when I opened steam it took quite a while (I guess it updated again). My following tests were all successful, no ap problems anymore.
Sorry for the confusion and thank you for your time. Aerofly FS2 is a wonderful product. I would love to see my 13 GoFlight products working one day.
Regards from Switzerland,
Thomas