Most of my planes use elevon/delta configurations. I have them all working on my tactic ttx650 and 850. Recently I went to the flying field and something strange happened. The elevons on EVERY plane stopped working. The ailerons work fine but when I move up or down elevator stick it acts like they are ailerons. I tried resetting the controls but nothing has worked. I changed the receivers but no luck. I even swapped a few of the servos but no luck. The only explanation I can come up with is that both the 650 and 850 tx's somehow got screwed up. Can the tx's be reset to factory default? Both transmitters are less than 1 year old and treated gently. By the way the planes that use elevator, rudder and ailerons work fine. What the #$@^&%$*& happened? HELP!