>Is there any mileage in having a register that you use as an internal
>counter of how deep in the stack you are, and setting an external pin and

Yes, someone already suggested this.  It turns out that a loose connection
was causing resets and spurious code execution with my new program, not a
stack issue.  But these suggestions and information about the overflow/reset
bits on the 17 and 18 series PICs are useful to the list, anyway.

--Andrew
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