Decided to bite the bullet and upgrade to PIxhawk. Got everything and everything went smoothly.Used Futaba sbus link from RX to PixHawk. Works fine. CH1 CH2 for speed and steering CH7 - learn CH8 mode.
Configuration is Ardurover 2.46. MP 1.3.10. Compass and Radio calibration went well. Left all parameters at default at this time. Mavlink works fine over 3DR radio.
Installed on 6x6 with TrexJr motor driver. Manual mode works great. 6X6 steers well and speed control is nice and smooth.
Next, loaded an old waypoint file and wrote to Pixhawk. Read back from Pixhawk. All good.
Next took 6x6 outside and got GPS 3D lock in a few minutes. 11 sats hdop 2.05. Both pwr leds are green. ACT led is blinking blue. Big RGB led is solid green.
Drove a few inches in MANUAL. I guess it does not have to be armed to move in manual !
Pressed blinking safety switch and it went solid. MP DISARMED message went away. Good to go ?
Now switched to Auto mode. MP window shows Auto.BUT 6x6 does not move at all. Switch back to manual and it moves under RC control. Back to to auto - just dead in the water !
Totally perplexed. Any help or ideas appreciated. Either something is busted or I am doing something silly.