I don't have loader files for 16 or 40MHz and the 18F4620 so I can't look at config fuse settings.
If you open the loader .hex files for 16 or 40MHz with the MeLabs serial programmer, then click on the C to bring up the config screen, what does it show for the MCLR Pin Function?
If it's set to Reset, you shouldn't have any problem. If it's set to Input Pin, you would need to power cycle to reset.
If that's not it, give Dave Barker a shout.
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