Just thought I would drop this in here in case anyone else has a similar problem I uninstalled my Zurich 2.0 and reinstalled to version 2.5 - fine, but after doing that my GSX would not work. I uninstalled GSX and reinstalled, and all is fine. Admin. might like to comment, but should this happen to you, perhaps updating any other FSD Airport, then no need to start placing lots of Post here, just uninstall and reinstall GSX.