Hello, I'm having the same problem as talked about above. Whenever I have the autopilot engaged I can barely touch my Pro flight Cessna trim wheel and the plane starts climbing about 200 fpm but it will come back to the correct altitude. When I disconnect the A/P everything stays stable untill I move the trim wheel and then I get the same thing. After getting the plane back under control everything is fine. I've tried the two options under the misc. tab both off and on and all the combos with no results. This happens on all planes. Pete, in your post above you mention making sure the trim wheel is resonably close to the indicator, or at least thats the way I'm reading it, but that doesn't help because it happens even with the A/P engaged. I have 4.827 installed.
Thanks Mark