Hi Mike.
I don’t have your exact problem, but I find it curious that when I attempt to fly the A310, my CH throttle activates the reverse thrust only (when on the ground). I have checked and re-checked my controller settings, as well as testing it on other aircraft, but cannot solve it. When I use my mouse to increase throttle and get air born, the throttle works. It is only a problem when on the ground.
Tim