I'll also order up the components to assemble Roberts PCB to see if the issue is with the breadboard... but that might be a while as funds are limited at the moment.
I should think you'd have enough components from your protoboard ckt of reply #15 to wire
the Crossroads pcb for minimal testing. At least you know the wiring is straight.
And yeah, the 100pF I mentioned was for the RX0 low-pass filter, 100nF is for bypassing Vcc.