Yeah thats basically the problem. I had the GTB set up to Profile 1 and set up to standard with DX3.0 (ie. reset throttle max/brake max) and then when I switch to profile 2 (which has rev) there is no reverse when I hold full brake? Not sure how to set up the 50:50 profile though and I think GTB mentions something like that needing to be done...

Help appreciated Dan & Dave