Hi Umberto,
I would like to report that often after I land at the destination airport I see anomalies with the GSX objects.
For instance, this afternoon I landed at EGPD with the PMDG 737-700 NGX. The follow-me vehicle was invisible apart from the driver and wheels. I followed the floating driver to the parking spot whereupon I saw the marshaller's head; his body was invisible. I requested deboarding and noticed the forward stairs were invisible except for the driver and the canopy (the rear was fine). The bus arrived and it was just like the follow-me car; invisible except for the driver.
Like I said this nearly always happens to me at the destination, only once I've seen it at the departure airport. In all other respects FSX is fine; I don't see any other anomalies. I realise of course the NGX is quite heavy graphics-wise, so I'd be interested to see if other NGX flyers have seen similar issues. I may fly the iFly 737 for a few flights to see if that makes a difference as it's a little less demanding.
Cheers
David
Edit: Just wanted to add that Advanced Animations are ON, and GSX works fine most of the time so not an FSX configuration problem.