I have now updated mach to the latest version 3.043.066 and created a new profile to ensure my xml wasn't corrupt. everything still the same. I am thinking it is something to do with the bob as it used to work on my zpa5int bob. This is the board I have at the moment http://uk.stepperonline.com/5-axis-c...tv2-p-197.html . I am also using a un300eth motion controller.