First, try to reset all the airplane configs to default, to eliminate the doubt something's wrong with your airplane customization. The Aerosoft Airbus are internally supported by GSX, so they don't require any customization.
- Remove any folders related to the Aerosoft Airbus from here:
%APPDATA%\Virtuali\Airplanes
- And also remove any GSX.CFG files you might have in the airplane own folder ( the one that contains the aircraft.cfg )
- Restart the sim and try again.