No Indication and final guidance on Parking Spot (Gate 11...LSGG or Gate 53... LSZH), docking system is still dark.
Works fine here.
It's not clear from your message if you have installed GSX and you have activated the parking with it. Docking systems are supposed to be blank, until you select it in GSX.
The A/C is Aerosoft Airbus 320, newest version for P3D. The aircraft stands on the apron, then the jetway arrives and sinks down through the concrete.
The problem doesn't have anything to do with GSX (that doesn't handle or control jetways) and the scenery either, which uses the default jetway animation system, just with a custom 3d model. The default jetway animation system in P3D hasn't been improved compared to FSX, so it has the same old bugs, like sinking wheels with some airplanes (even default).
Nothing we can do about it. That's why several scenery developers are moving away from the default jetway animation system, and are supporting SODE, which fixes most of the problems of the default jetways animation system.
We'll support SODE in the next GSX version, and we'll start using it with KMEM. Hopefully, we'll revisit our existing sceneries to add SODE support to them too.