got in car today.. it did not detect the DUE or shield.. so no tuner. Drove it to wherever I was going. Shut car off. Restarted a bit later.
DUE was detected this time, but tuner was trying to work.. I pressed a preset and I heard the Tuner ‘click’
I swapped back to my Serial/USB cable and Tuner was fine.. I am thinking maybe the Headunit I have will not play nice with the shield