Rebuilding doesnt work. GSX can not find the AFCAD in the scenery folder of the uk2000 airports. The problems are there with all UK2000 airports ….
Try enabling Logging in the Troubleshooting section of the GSX Settings, and choose "Restart and rebuild the airport cache" in the Couatl menu.
After the cache has been rebuilt, if the correct AFCAD is still not used, exit the sim and check the log file at %APPDATA%\Virtuali\Couatl.LOG, ZIP the file, and Attach it to a post, so I can check it.