Sorry Pete, I guess that information would have been helpful. See the sig. I was told it might be something in the FSUIPC winds controls. I don't know, not cast aspersions here, just trying to get it fixed. I am not sure conflicting elevator trim is the answer but it could be. It really only happens when I am at high altitude and on auto pilot. If I kill auto pilot controls, and can manage to regain control before it barrel rolls, I can manually fly straight and steady. But at high altitude and on auto pilot, she wants to wag right and left. It's making the passengers very ill. (LOL). As I said, it happens with any of the high-end add-ons like the LVL D 767, PMDG 74, CS 767/757. That is why I felt it had to be something besides the planes. As far as contols go, I have a CH Products Pro Throttle and a Logitech Extreme 3D Pro Joystick. I have all of the flight surfaces controls shut off on the throttle. It's just a throttle quad. But I can check that again. It would seem that if there was a conflict, it would happen all the time, however, and not just on auto pilot and at high altitude.
Thanks for any thoughts...