Bruce,
sure I have 100n Caps next to the Chips and the Powersupply is as clean as it can be.
I don't think it is a "noise in general" problem, if I leave the hardware setup as it is and just comment that "SERIN2" line out the 18F never stops.
I have had some problems when I did my first migration from 16F876 to 18F252.
After I had sorted that out I felt the 18F is a nice pin-compatible replacement for the 16F.
But it looks like if you want your product to be robust and reliable stay away from the 18F's.
regards:
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