I am NOT a technician, but I would make the following recommendation: — remove the FlyWithLua folder from your plugin folder. — launch X-Plane and see if it is working … — look for a newer version of both FlyWithLua and Real Terra Haze RTH. I have uninstalled FlyWithLua and RTH on my iMac running El Capitan and X-Plane 10.41 and 10.42. It works, except one crash due to SASL (resolved by updating to SASL 2.40). I hope this might be helpful…