I think I found the cause of this on my sim it is when I load in and only open up GSX to request pushback not deboarding/boarding. Just start p3d 4.5 Hotfix 3, load into sim, get plane ready, open gsx and request pushback. Then go fly and land at airport and request a gate, taxi in and marshaller (or parking/docking system if no marshaller) gets stuck when I park and turn off engines and request deboarding.
