Found a strange problem on the '877 I've been using for a few months.  One
of the registers all of a sudden decided not to work anymore, this after
debugging a small code change, I finally went back and found that the flags
were not being set right, and in fact, I couldn't write to it at all.  I
moved it one location further down, and now it works.  To verify, I put in a
movlw, movwf commands in and the register never accepts the data.

So, question is...anyone else all of a sudden found a register that decided
to fail? Makes me a little nervous to release something that might have a
failure in the future.

In addition, using the ICD to program the chip in circuit, it seems that I
don't always get a good burn. In other words, I can program it once, and
something doesn't work quite right, and then I can reburn, and it does work.
  Anyone else seeing this as well?

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