I have reinstalled FSX and the JS41.....no startup problems anymore....just load FSX with the default aircaft (Trike) (show opening screen is off)and go to the Tutorioal flight of the JS41.You can also save your own JS41 flight thereafter and startup without any problems.Only problem left at this moment is a black (and not working) FMC.regards,Ben

And to close this tread with problems......my FMC is finally working!i did nothing.....just flew the JS41 without FMC because it was black and not working.After some day's with some flights i tried to startup the FMC once more, and it functions now!Don't know why....it just is working properly and suddenly.Regards,Ben