Rob..
Just wondering about something with the resonators...The ones I bought, didn't say they had capacitors inside them.. The new ones I bought and replaced the old ones with say 15pf capacitors built in, so I looked up the spec sheet on the old ones and sure enough, no mention of capacitors! So when I replaced the old with the new and reprogrammed the PIC with the newer hex file, I had already fixed my oscillation problem without knowing it. Does this make sense to you?

As a test, I resoldered the old 16mhz resonator to the boards without the capacitors inside and my problem came right back...so It was the resonators all along I think. Now if I had chose to use the crystals instead of the resonators, I would have had to add the capacitors right from the start and none of this would have happened in the first place.. What is the part number of the resonators you are using? My new ones are Murata CSTLS16MOX53-AO ....The old one was a Murata CSTLS16MOX53-BO....The new one says 15pf and the old one did not! Could this be what my problem was??? I sure hope so...Everything placed back to original on the board with the new resonator makes it work perfectly.

John