For me, it does not work.
Again, GSX IS working, what is not working, is your P3D installation, which is not complete, because it miss the updated files for the new menu system (the transparent ones), when used by 3rd party addon so, without those files, NO 3rd party menus with a menu will work, NOT JUST GSX.
I can only repeat and confirm, the problem is solved this way:
- Uninstall the P3D Client
- Download either the P3D Content file or the P3D Full installer.
- Install the Content, then reinstall the Client or, if you downloaded the Full installer, just the Full installer.