Okay... I've been digging around a little with Vidan Design EKBI...
It seems that GSX is working correctly but for some reason, the scenery itself is incorrectly configured. Perhaps Umberto can shed some light on what this means...
I found this in SODE.log file:
[15:31:33.794] DEBUG SODE.FSLOOP : [API::TRIGGER] Received Trigger Client Data: ObjID=8, DoorDesignator='1L', OwnFlag=0, DoorDataOverrideFlag=1, Mode=1
[15:31:33.794] WARN SODE.FSLOOP : [JETWAY CONTROL SYSTEM] No 'jetway.cfg' found. Unable to move Jetway...
Something in the scenery is missing, because I assume that the API::TRIGGER line means, that GSX 'asks' the SODE jetway to connect - but SODE throws an error back, saying it can't find a 'jetway.cfg' file... Hence, the jetway won't move...
I guess, I'll have to see if Vidan Design will take a look at this...