only can get travle one way mix with rudder travles bouth ways don't know what I did any help Al

Hey Al, if you have a computer radio, you may have set the travel in the rudder at "0" on one of the control directions, and now when you throw it that way, it goes "0" or doesn't move.
What model JR transmitter do you have? What model of receiver are you using? Is the Servo pluged in wrong?