Looks like you have the same problem I had, which is that config.g is not running at startup.
Workaround: press the Reset button on the Duet before trying to connect Pronterface.
Fix: ditch the SD card that came with the kit and substitute a decent one (I used a Maplin own-brand 4Gb class 10 card).
Edited 1 time(s). Last edit at 12/22/2013 10:46AM by dc42.