Hi David,
I was just going to post the same issue when I saw your post.
I was flying from Miami to Rome yesterday and upon arrival and clearing the active runway I used the GSX hot key and was informed that "ALL the gates are too small". So then I taxied to a ramp space and again was informed that this space is too small for ground services.
Rome is one of my updated airports from Flyaway Scenery. So i tried the other updated airports also from Flyaway Scenery (Miami, Istanbul and Tampa) positioned the aircraft at the runway and invoked GSX. On all airports the gates where too small. I you look into the positioning selection of the aircraft in FSX, ALL airports list Heavy gates.
I then tried a non updated airport, Los Angeles, positioned the aircraft at the runway and invoked GSX: there where several Heavy gates, some occupied Heavy gates and also several available for parking.
So it seems to be an issue how GSX receives the gate information from FSX. I don't know how the updates/downloads from FlyAway Scenery effect the gate information.
Maybe someone can shed some light at this issue.
Thanks
Juergen