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OK - Mystery solved!
I had not installed the R4/R7 jumpers on the USBTinyISP that are necessary for boards with loaded pins to be programmed. Put this in the 'knowing just enough to be dangerous' files.
Now it works fine - thanks for the help!
Thanks for the sanity check - good to know that I was at least on the right track
The results are more or less the same:
Programmer Type : USBtiny Description : USBtiny simple USB programmer, http://www.ladyada.net/make/usbtiny…