APM 2.8 throttle does not respond once armed

APM 2.8 from California(China). I have everything working. 

When I armed for a test flight yesterday, i could arm the apm, props started to spin as expected. I push the throttle up to enter a hover and it barely rises above a low idle. Ive trolled the forums but am stumped. I've calibrated the radio, esc's multiple times, still the same issue. If i run the tests on the motors through mission planner, the throttle responds as normal, just not when armed to fly.

Any thoughts?

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