I am using Aerosoft Airbus X Extended ... I did rest and tried again and the same thing. I then restarted FSX and tried with stock plane and same problem. As soon as I call for a Service, Coualt disappears from the addon menus and i've noticed that the vehicles outside disappear too ![Huh ???](http://www.fsdreamteam.com/forum/Smileys/default/huh.gif)
Doesn't happen here, not with the Airbus nor with any other airplane, of course.
First, check you haven't installed a GSX.CFG custom configuration file for the Airbus X in its root folder ( the one under Simobjects\Airplanes ), because if you put a file there, the "Reset" option doesn't remove it.
If that doesn't work, perhaps you have a corrupted file in your preferences, which are NOT removed by uninstalling. To remove all GSX preferences, remove the %APPDATA%\Virtuali folder and REINSTALL.