Good Morning Umberto,
I did as you requested and this is what I have. The first test was with the default A321, Location KCAK: Active runway: Static weather(Fair): Selected daytime 12:30PM. FSX spawned the AC on runway #1 engines running. Called up the GSX UI selected parking Gate 5, no follow me vehicle. Taxied down the runway and turned off on taxi way Bravo almost directly in front of the gate. Followed the director's instructions and parked where GSX wanted the plane to stop and shut down the engines as requested. Unable to use the jetway as the AC is too far forward of the parking "T". I then selected deboarding from the GSX UI. The GSX service vehicles went into action and serviced the AC. GSX completed normally and I proceeded through the menu of options ending with push-back. Ended the flight.
Loaded another flight using the same AC and parameters only this time selecting to start at Gate 5 KCAK. The AC spawned at Gate 5, engines running. I started the flight applying brakes so as not to put the nose of the AC in the building. Using thrust reverse, I moved the AC back so the nose wheel was on the "T". I shut down the engines, opened the main cabin door and activated the jetway. After the jetway was attached, I called up the GSX UI and selected deboarding. All service vehicles appeared, I opened the cargo doors, and GSX went into action. GSX advised that "Deboarding Passengers now, baggage unload in progress". A few moments later, GSX advised "Passengers deboarded, baggage unload in progress". The AC was unloaded, the pallet tug and baggage tug left the AC and thats where the hang up is. GSX would proceed no further. The UI advises "Passengers unloaded. Baggage unload in progress". If you select any other services, the UI responds with " XXXXXXXX requested, waiting for deboarding to complete". Using the options of "Reset Position", or "Restart Couatl" from the menu is the only way of getting things moving again. At this point there are 2 options, One, you can start GSX again this time skipping deboarding and starting with Catering service. GSX will complete normally. Or, I found out you can start the engines again and move the AC back where it was originally spawned forward of the "T". I didn't even close any doors. Start GSX over again and it will complete all services normally. I started another flight same as above, spawning at Gate 5 engines running. This time I shut down the engines and used "Shift+P" to move the AC back to the "T". Again, GSX would hang at the same moment displaying the same messages. I used all default settings and made no adjustments to the radius, deboarding times, and payload/fuel. Something else of note, when GSX would hang, I started the engines. I immediately received a "Baggage unload completed" message from GSX. The only problem being all the service vehicles disappeared. But you could start GSX over again without moving the AC forward starting with catering service and GSX would complete normally. Weight and payload is as follows:
A321
Payload: 14340 pounds
Fuel: 7635.66 gallons
Gross Weight: 159160 pounds
Max Gross Weight: 187392
Max Allowable Fuel: 7790.00
I also performed all the above using the default 737 at KCAK using GATE G3. Same parameters just a different gate. The results were identical. I ran the tests again not using the custom repaint just to be safe.
B738
Payload: 22850 pounds
Fuel: 6830.35 gallons
Gross Weight: 154323 gallons
Max Gross Weight: 155500 pounds
Max Allowable Fuel: 6875.00 gallons
Conclusion: If you leave the AC where GSX wants to park it, or where FSX spawns it when starting from a gate or parking position, one should be OK. This does not usually work. As mentioned in many other posts, most AFCADS are really bad and one needs to move the AC to get the nose out of a building, or the nose wheel back on the tarmac, utilize jetway, etc. GSX was never this precise before. For me, in previous versions I always used shift+P to move the AC back. Depending on type of AC, sometimes thrust reverse was not available or did not work. When I first tried shift+P, I was concerned that GSX would start the pushback process. This was not the case. GSX ignored it, the AC would go back to a visually correct parking position and all would be well. I had no other issues using default, payware, freeware AC. The only issue I had was corrected in the first release with the follow me vehicle. Thats why I was so dumbfounded. GSX was working perfectly until I installed v1.3 Then it dawned on me the other night when you were asking for "precise details" I did not mention moving the AC back to the "T". I would have never thought moving the AC would cause any issues because it's something I have always done using GSX. I hope a little lee-way can be put back in. I hope this helps Umberto. If anything, it's as you said "at least we have a base to further test" Maybe this helps other people reporting this issue. If I can do anything else, please let me know. More than happy to help.
Regards,
Rob