I'm am thinking what I changed recently on my p3D
Maybe what you really changed was UPDATING P3D using the Client installer ? If yes, it's a problem that has been discussed so many times on the forum, and it's not a GSX problem.
It's a P3D installation bug: the Client installer doesn't update certain files that are required to have the menu system working so, if you update P3D with the Client installer only, no 3rd party application with a menu will work. This is fixed by downloading and installing the P3D CONTENT, or the P3D FULL installer.