It appears GSX jetways works fine only for MSFS, P3Dv4 and P3Dv5, "maybe".
FSX will need to use the non GSX jetways but original from airport scenery Developers.
Probably I will have to remove the whole GSX ground services from FSX, P3D and MSFS until GSX and GSX Pro becomes a full working artwork.
Patricio Valdes