I have upgraded all of my Solo systems to 3.0.0 (but not yet to use the Green Cube).
I have connected a servo to pin 19, and a nearby pad with +5VDC, and a ground pad.
I also used Tower to change the RC7 parameter on a Solo from zero to 1.
Unfortunately I am seeing intermittent behavior, including both haptic bumps and Controller displays. Sometimes "On/High", sometimes "Off/Low" in the lower part of the display. Power is getting to the servo. The servo does change state, just not when expected. Most often, the output at pin 19 appears to get hung up in the "On/High" state. Occasionally but not predictably the state will shift to "Off/Low" after seemingly random taps or hold-downs of the Pause button.
I've tried swapping Controllers (no change, although I did discover a sticky Pause button, now fixed).
I've re-soldered all connections (no change).
I've rerouted cabling to the servo (no change).
I am beginning to think that upgrading to v3.0.0 has resulted in different-from-stock-Solo behavior with pin 19.
In searching for an answer, I discovered this comment: "my pwm range was too high, shortening the range fixed it."
If that "fix" works, does anyone have a suggestion for how to change the PWM range in OpenSolo v3.0.0, and how to set the parameter values that are likely to work?