As I've said, it's not possible that Couatl crashed the sim, since Couatl, as an external .EXE, cannot crash the sim.
When you select the customize vehicle location, the jetway becomes active and is sent to SODE so, again, it's possible that's might be an issue with it and it can possibly caused by another scenery in the Chicago area.
Are you able to customize the GSX vehicle in another airport ?