> For some reason on the 16F1459 Microchip has chosen to put the external
> interrupt  on the same pin as the in circuit serial programming clock.

Are you attempting to debug while plugged into the USB? IIRC Microchip have=
 made the USB pins alternate debug pins the same as the 18F14K50. As doing =
any debug will interrupt USB operation this may be a way out for you.
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