As explained many times, when reporting such problems, always indicate ALL the following:
- The airplane used. If it's not default or a GSX supported one, the file you used to customize it.
- The airport use. If it's not default, indicate the scenery used.
- The gate used.
Also, try to enable Logging from the GSX "Troubleshooting" page, this should create a Couat.LOG and Couatl.ERR files in the %APPDATA%\Virtuali folder, post both of them, after a crash.