Help troubleshooting a Komby RF1 system

Hi:

I built up my Komby RF1 system last week; tested the transmitter (RF1 with a PA and rubber ducky antenna) and a receiver (RF1_12v with DMX serial input) with a short string of PixaBulbs (12v, WS2811) and after some stumbles, all worked. Put it aside for other projects and came back last night to start adding more bulbs and nada.

Nothing changed from last week's success to this week's failure.

I have:

*Checked the voltages on the boards -- all correct.

*Checked the signal wiring -- rings out.

*Installed the TestRFTransmitter sketch on the transmitter chip -- nothing.

I am now officially stumped.

Any insights into further troubleshooting would be appreciated.

Thanks.

\dmc