PMDG MD-11 Elevator Problems/Glitches

Hello,

I installed a download of the PMDG MD-11 to FSX Steam Edition.

It works fine at times but then at random times the throttle is not able to be controlled by the joystick(Logitech Xtreme 3d pr0).Yes i am using Window 8.1 but thats not the only problem,when this happens the elevators glitch in a way i cannot explain so i left a video.I hope for a solution.

PS I am also using the black gauge code 

https://www.youtube.com/watch?v=DeMATFRyLA0