Codewarrior programming MC56F8367 gives Unknown protocol error

[Signalds]

I have been developing with Codewarrior for about 7 years, and we have (finally!) got into production. I received 10 Cards which have the MC56F8367 DSC fitted, and began to use Codewarrior to program each with our latest firmware. 6 of the boards programmed fine, but 4 of the boards did not. Codewarrior reported "Unknown Protocol Error". My Codewarrior version is 8.3 (build 091203). Anyone got any ideas as to why this might be happening?

[johnlwinters]

This is the error message you get if you do not supply power to your board.

I have never seen this error message in other circumstances.

However, if there is an electrical problem on the JTAG interface, it could give this message.