Test all motors: only 3 spin. In Sequence: all working

ArduCopter Copter 3.6
1

Hi all,

at a bit of a loss here… Quadcopter with Sparky 2 board. Worked with Betaflight, so I doubt it’s hardware-related.

In the Motor Test tab, I can test them all in sequence (or individually), and they all spin up fine. If I choose the “Test all motors” option, only three out of four spin up. The fourth (Motor B) doesn’t do anything.

Any ideas?

Cheers
Oli

2

Nevermind. Rebooted the whole thing (including Mission Planner), and it’s working now. Strange.