Thanks guys for your responses. This is interesting. I am also using CamBam for my G code. The drawiing was generated using Sketchup. The SKB file was converted to DXF that CamBam used to generate the G code in a .nc file. Mach3 readily opened the .nc file. I had to make a few changes to the code to get the depth correct and to force a stop to make a manual tool change, but, other than that the code has worked without problem except for this one skip.
I will look for mechanical interference but I have moved the piece I am cutting to different location on the mill to look for that type of interference.
In the meantime I will try splitting up the one line into two steps in the x axis to see if that resolves the problem.
Tweaki, I will email you the code since I dont know how to attach directly to this post.
Thanks. Art