Recently, I've tried to start some addon planes manually in FSX and the aircraft begins spazzing out and bouncing all over the place. They continue to until I reset the session. My best guess is It's the fact I'm on the Steam Edition of the game and they don't like that. It's only 2-3 planes that spazz out if I touch the starter. If it is the Steam Edition causing it, I can handle not manually starting those aircraft.
Anyone know whats causing the problem?