Also try using Arduino build 0010. I think I read somewhere that the later versions do not work for the arduino firmware at this time (but do work with Sanguino/RepRap Motherboard?).
Scroll down a little on this page and you can get the older builds.
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arduino.cc]
Edited 1 time(s). Last edit at 05/07/2009 02:36PM by Jeff.
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www.binaryconstruct.com]