Hello to you both.
I have the very CH yoke used in the demo and it functions perfectly in earlier releases of X-Plane up to and including the last release of X-Plane 10.50. It still works in it. But in X-Plane 11.00 to X-Plane 11.05r2, the sliders are giving me issues.
On the Laminar 747-400, the reverse thrust slider assignment functions but the speedbrake slider assignment does not function.
In my SSG 747-8i, the speedbrake assignment does work but the reverse thrust slider assignment does not work.
Two different aircraft providers are having Joystick assignment issues. Even the Laminar provided 747 aircraft has issues and it's their aircraft!
I am constantly burning the SSG brakes as that's all I have to slow and stop the aircraft.
My submissions to the bug center have not had much effect on the resolution. I submitted it 6 to 8 months ago.
I believe following the suggestion given by CaileanNZ may help you to some degree, depending on the aircraft you fly.
RThomas18