Thank you for the information, Umberto!
My KSFO scenery is higher in the order (and greyed out along with the rest of the airports in the FSDT Live Update) in the world scenery folder, so that seems interesting.
FWIW I just did a flight from T2G KSEA to your nice KLAS and the gate assignments for both are drawing correctly in GSX (using the same protocol), not drawing on ORBX PNW in the case of Seattle (and KSEA is not greyed out in my scenery library).
When I first load a plane at KSFO, it is positioned at the gate correctly, but GSX is not recognizing that as the correct position for ground services, it wants to slew the AC to the GSX position, which is 10 meters off, to use ground services.
Anyone know how to stop GSX from calling on ORBX KSFO versus FB's KSFO, or how to disable ORBX KSFO without breaking the scenery in this new protocol?
Many thanks!