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I just upgraded to ArduCopter 2.5.5 and I am having trouble. Takeoff looks totally eratic. So I started by testing motors using Mission Planner CLI / Setup / Motors. It used to test them starting with front motor and going clockwise testing each motor. The actual motor order as you go clockwise was 146235 (APM2 output numbers) but now I am getting 145236. The 5 and 6 motors have swapped places. Is this only in Setup/Motors that it has changed or is it also in flying modes. I will see if I can do more testing tonight.

I use a 3DR Hexa body with the 880kv motors, APM2, 6.0 Lipo.  ArduCopter2.5.5

Thanks Ray