Not really a crash

When I change an airport FSX starts up aircraft end of runway pointed into the wind,but it is 400 feet off the ground.I have looked inside red light flashing pause you un-pause you sometimes pulled out sometimes you do not,or if your on a runway go forward two feet and crash the plane is on fire.Do not have any idea what to do. I have take out all saved flights.Have one default flight it loads ok for it.Any ideas????