When I check at the airport after I have used GSX to move the aircraft I find it is using the AFCAD file for the default scenery and not the UK2000 add on . ie it is using Area0501/scenery\APX47120.bgl and not the AFCAD file in the UK2000 scenery , any idea why please . ( This seems to sppy when using any uk2000 addons )
First, try to force a cache rebuild, by removing the following folders:
%PROGRAMDATA%\Virtuali\Couatl
%PROGRAMDATA%\Microsoft\FSX\SceneryIndexes
And see if GSX will then use the correct file (after waiting for the cache to be rebuilt).
It the AFCAD is still not used, assuming the cache has been rebuilt correctly and with no errors, you might then check in the Couatl.LOG under %APPDATA%\Virtuali (you must enable logging in GSX), to see if the AFCAD has been rejected for some reason.