I having a similar issue, when the Bus comes to load passengers it gets close then freezes, wheels still turning and GSX does not responded. Then when restarting the simulator I have to reinstall GSX and GSX2, activate s/n. Only occurs when loading passengers, can do push back and call fuel truck with out issue. I am also using a smaller aircraft, DC-3, with small steps. I saw an issue with small air crafts in the forums and have tried using the update tool, but did not resolve, is there any debugging I can turn on?
Thanks,
Patrick