Whenever I fly my PMDG 737NGX and I hit 26,000 feet or FL260, my fsx crashes. It stops working and gives me an error message like FSX has stopped working. I don't know why. This never used to happen, only recently did it start. Any help?
Correction: It only seems to crash when I am flying a flight for Delta Virtual Airlines with my FMC programmed.
It seems like a software is making it crash.