The problem was/is the Pyramid power supply for the AP1200 mount. It showed 10V at idle, and trying to slew with buttons in the ASCOM driver window didn't move it at all. I adjusted the voltage to about 14V, and all is well. The mount slews, and ACP just completed two sets of dusk flats.

Time for a new power supply. I think the Pyramid's potentiometers are flaking-out.

--- Mike