No. 2 motor not turning

Running Pixhawk on a quad, fw 3.2.  No. 2 motor does not turn when the FC is armed and throttle applied.  But the motor turns individually using the motor test in Mission Planner.  I recalibrated the accels, and the FC passed all tests (which I ran through the shell in the terminal).  Oddly, the ESC on ANOTHER motor (No. 4) feels very hot -- don't know if there a correlation.  Any ideas why No. 2 is not turning?

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