When I began using FS 2 I had no problems maintaining level flight but recently, immediately after takeoff I've found many aircraft are continually banking, either to the left or right - I can correct it but as soon as I release the controllers the same constant turn resumes. As you'd expect, the AP resolves it and maintains a level course, even using the default.
I haven't exhaustively explored the behavior of all aircraft but for those that I have, it seems, strangely, to effect lighter/piston craft. Perhaps I've missed something but I've tried resetting controllers, even switching between Oculus touch controllers, Xbox gamepad and my new Thrustmaster FCS hardware, all with the same issue. I haven't changed conditions and verified wind isn't playing a part
From my experience I've come up with the following list:
Cessna 172 - banking left after takeoff.
King Air C90 - banking left after takeoff.
Sopwith Camel - banking right after takeoff.
Baron 58 - banking right after takeoff.
737-500 holds level.
747-400 holds level.
Learjet 45 holds level.
All takeoffs are from Mc Carran, Runway 25L
If anyone can offer any thoughts or insight it would be appreciated.