One to keep in mind. When disabled, the Roborio sends no PWM signal which the speed controls interprets as disabled. When enabled the Roborio sends the PWM signal it is told to send. 0 speed or "neutral" is actually in the middle of PWM band which is distinctly different than the disabled non signal. The LED on the Victor will tell you the signal it is receiving. Writing the signal that is being sent to the PWM channel is also useful. You can write to smart dashboard or print it to the DS message display. BTW It is not unusual for an unloaded motor to spin slowly at 0 speed if you are using a joy stick to control it without any headband for zero speed.
The meaning of the various blinkly control systems LEDs can be found
here. Really useful for findind ghosts and other control problems.