Nothing in the latest update has changed anything that could possibly affect the Parking System. I see you use P3D 4.5, see the following video showing it working perfectly fine, both using a Marshaller, and also after adding a VGFDS.
I DO see an error in your Couatl.log, which is strange, like a racing condition or communication error with the sim. Maybe you called GSX too quickly, when it was still creating the objects ( custom jetways or Docking systems ) that maybe you added to the airport in the GSX profile ?