John, I will try powering up the RS board with nothing connected. I'll let you know what happens. The coupler problem appears to have been a bad solder joint which I have corrected. The overall problem could, certainty, have been a bad connection somewhere. Surprisingly, there is not much room inside an F3 shell when you begin stuffing with the boards and a speaker.
Thanks again, you guys have been great in helping me work through this.