I can confirm that with the final X-Plane 11.10 now out, the autopilot of the Saab 1.4 has problems. It oscillates with ever increasing amplitude around the set values - a behavior I would expect form a PID Regulator with a too small or absent D term (the differential dampening term). I must say, I saw similar things in the Rotate MD-80 (not as pronounced, but still clearly discernible) and that one also uses the X-Plane bultin ATHR and Autopilot. In the long run I think it more than makes sense to implemenet an Autopilot if it's own for a plane - relying on the X-Plane stuff seems to break planes over and over again. What astonishes me though is that with 11.05 the autopilot seems to work ok - that a minor version increase of a flight sim breaks an autopilot so severely is a bit of a negative surprise (and has a lot to do with XPlane, not with you guys).
