Recent strange turn to the right.

I have been using my MD-11 without any problems for about 200 flight hours.I am using the FSX version of the aircraft.On my last two flights the aircraft upon taxi out has been turning to the right... requiring constant correction to the left to taxi.Upon takeoff and autopilot on.. the aircraft will turn away from the command bars to the right.. in any mode HDG/TRK or nav.I thought maybe there was a problem with my joystick so i re calibrated it... the problem is still there.So after takeoff i unplugged the joystick from the system and the turn is still present.the rudder and aileron trim are both zero and the aircraft is within balance.It has all of a sudden made this great addon un flyable.Could someone point me in the direction of what is causing this issue?Mark