OK. I'm quite confused by what I have just seen. First of all prior to a few days ago while using connected directly with FSX I never had an issue and specifically the ailerons were smooth. So just to prove to myself that the joystick had not gone faulty I pressed reset in FSUIPC calibration (don't know how or if it is possible to disengage FSUIPC without uninstalling it. I then ticked (enabled) FSX joystick control as well as set the asignment of the ailerons to the joystick within FSX after running a test flight. Swapped to outside spot view and found the joystick was perfect. smooth and moving from one extreame to anther. I then disabled the joystick again in FSX and removed (unticked) the aileron asignment. Looked outside and the ailerons were still working fine. Then I re assigned them to FSUIPC and imediately they were back to two extremes and one position half way between.
If it helps here are the settings
Fully left: In 16383, out 9984, delta 7520
Centered: in 128, out 1280, delta 7520
fully right: in -16384, out -14360, delta 7520
centered again: in 128, out -6746, delta 7520
Does this give you any more clues. We at least know the joystick is still OK.
Cheers Anton.