Thank you to all who offered suggestions and ideas, it was all helpful, if
only to extend my knowledge of possible fault conditions.

I now think the problem is associated with PORTB, 6,  as when I change my
code to have the switch on PORTB, 5 it works fine.

The data sheet shows PORTB, 6 is also the serial programming clock (this
shouldn't do anything with /MCLR tied high?) and part of the ICD circuit (I
don't know anything about this).  My project is moving ahead again now with
PORTB, 5, but I would like to know if I missed a configuration bit or
something that might have caused this.  I definately don't want to have this
problem again.  I have another project which uses PORTB, 6 with no ill
effects so far, though I would like to clear this up before I commit it to
production.

Thank you all again,
            -Carl

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