One idea that'll pretty much eliminate programmer issues...
1) Erase the chip
2) Reboot the entire system
3) Readback and verify the chip is erased
4) Reboot the entire system
5) Program the chip with anything
6) Reboot the entire system
7) Readback and verify the chip has exactly what you programmed into it
And there's a fine 'blink the led' example right near the front of your PBP manual which won't take hardly any modification to get to work with the '452 as long as you follow the directions in the manual.
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