Follow up to this:
Have tried upgrading the AVRISP to 0x010d (v1.14) using the latest AVRStudio, but no difference.
Does anyone know where I can get older versions of the AVRISP firmware to try rolling it back to the version which works?
At this point I am not clear if the AVRISP is damaged or if it's the firmware, and I don't want to upgrade the working one in case it is the firmware.
--
Tim Mitchell