Got the latest .zip file, downloaded that, and RT is now working for me.  Thanks very much.

re: servo motor – I can move the white, plastic lever arm up and down, but it seems pretty stiff.  That is to say it requires a decent amount of force for my hand to move it up and down along its travel.

re: the servo moving ever – no, I have never observed the servo motor doing anything under power. No up, no down, no seeking center position.  Any commands to the brush that I send via RT or RoboPaint do not cause the servo to move the paintbrush up or down.

I’ll give the wire swap a try and report back.