Yeager, when you say a vaule is "stuck", please understand the value is being given to use directly from DirectX. If that value is stuck, then something else is going on.
Now, I used the "Z-Axis" as it typically is the rudder axis, however, it does not have to be that way.
When you move your rudder pedals, do any of the vaules in the "Select Joystick" panel change to reflect that motion?
The above also assumes the control manager for the stick is not being loaded.
If you have made changes to your stick hardware (i.e. added/removed/changed sticks), then you may need to wipe out the "joystick.cfg" file in the "settings" folder.