I would also try and delete (or move for backup) the "X-plane 11/output/preferences" folder, see if it solves the problem.
Reading through this page might give you more ideas :
http://www.x-plane.com/kb/
You have many third party plugins and addons, which makes troubleshooting very difficult. If you can, try to install a second clean copy of X-plane and add one by one your addons. There could be one guilty addon, or a combination of several addons not working well together.