Runway splines?

[joda]

Hello, I have a problem in the FMB of CoD: After I set a runway with the splines, I define it as e.g. concrete runway. On the Map I see the concrete runway then. Afterwards I save the whole mission and I play it. At the beginning lets say when you are staying ion the runway, starting your engines then I see that there is a concrete runway, but after my mission, when I am approaching for landing then the concrete has gone and there is juat a grass runway left!? I am very confused. Even when I reload the mission - which has been saved with the concrete runway....- the concrete runway has dissappeared!? Can anybody help me here? Thanks a lot!