I can no longer control cockpit or external views.  Freelook (right-click assigned) does not function and the view is now constantly tilting down (the view keeps rising upward in external view).

When this happened a few years ago, I was able to add right-click to the vertical and horizontal axis, but that approach does not work now.  Needless to say, I can no longer fly.  Any ideas?

UPDATE

I have rectified the situation - it was apparently tied to my Thrustmaster peripheral set-up: Thrustmaster T.16000M Joystick and TWCS Throttle.

The main culprit here was apparently not my mouse, through which I control Freelook, but the TWCS throttle.  The TWCS had no control tied directly to Freelook, but the Joystick L was tied to the pitch and yaw camera axis.

After I cycled the L Joystick on the throttle, the mouse was able to once again control Freelook in the cockpit and external views and the camera was once again stable.  Strange.