Hello Dave...
The xtal is a Citizen CM309S series...18pF Cl...

I tried the 1Mohm R across the xtal... no luck...
I also tried the series R from 10 ohm to 27 ohm... no luck

Maybe a bit more background...
Basically I have built 3 units... (I only had 3 PCB's built from the "quick turn" PCB house..)
2 worked... 1 doesn't... using the same S/W code...
but it took 6 - 18F1320 units to get the 2 working units....
That's why I thought it may have been a S/W setup problem...

The one key symptom is that the xtal osc isn't running...
This happened before... but I think because of IC swapping... it went away...

Dave W
N9DQW