That’s precisely the problem. I start the flight and sitting there on the gate, I click on the GSX menu and it spins for about 1 second and disappears. I click again and again and nothing happens. So I exit the flight.
Is your log coming after you see the menu disappearing ? If it is, something is very wrong, since your log doesn't even show you in an airport, it looks like a log where you went to the main menu, and exited the sim.
Are you using AI Traffic injection perhaps ? With too high settings, it has been found when the maximum number of Simobject allowed in the sim is reached, Simconect starts to behave erratically, so the communication with GSX stops, which might explain your log ending early, since GSX is not receiving anything else from the sim.