>One other fact I forgot to mention
>
>Target Vdd looks good now, using the ICD2 to power the PIC, reads 4.84 in
>both boards, but the 'bad' target Vpp is at 6.77 rather than 12.xx

Have you connected to the correct pins? You mentioned that the one that does
not work is a PLCC while the one that works is DIP. I believe the pin
numbers are different for the programming pins, and what you are saying here
suggests that you are trying to power the whole chip from the VPP voltage,
through protection diodes on the pin.

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