The refueling program is a blast to just sit and watch. I did just that this morning. The thing that got me was the exit doors, L2 & L3, the two service doors for the catering trucks, and the cargo doors opened and closed on their own. I don't know if this a GSX or PMDG issue. That never happened before but I never used the Ground Operations before either. I had all of the services in GSX selected but the doors would open or close at the wrong time. For example, while the fuel truck was still fueling, the doors for the catering trucks would open and stay like that for a good amount of time & then close. When the refueling stopped, the catering trucks came by and I waited to see if the doors would open on their own but I had to open them. I'll try to run the ground operations without GSX and see what happens.
I love this GSX
Papagiorgio