I just upgrade pixhawk firmware from arduplane 3.2.3 to 3.3.0. In 3.2.3 servo gimbal (2-axis) works well, but in 3.3.0 gimbal didn't move at all when pixhawk rolled or pitch up/down.
Then I am back to 3.2.3, and gimbal works again. When flying test, I have other problem. Plane suddenly goes down when switched to Auto or RTL mode. I push the both of reset button in Pixhawk, and install arduplane 3.2.3 firmware again, did all calibration..but have no change when in Auto/RTL mode.