It sure took a bit of time to read all of this.If I was typing all of these posts,we are talking a days work at my slow typing speed.Any how it is a little dissappointing after the lengthy read,that no one has presented any kind of a file,at all,that we may look at,possibly help with,or have someone teach most of us something that would be good to know.For what it is worth,I have had problems in past with toolpaths going too deep,but I figured out what I was not doing right.However I do not use 3d paths too often,so its possible there are other issues I am not aware of.But man,give up a file with this bug,then Burr will more than likely help us all in our knowledge of the software.Or perhaps,if he cannot,he will then say we got a bug.Got to produce the buggy file,not a picture,for Burr to work with.