You need to get rid of all the extra stuff in the dxf. All the dimensions, notes, arrows, paperspace layouts. Everything except what you want to cut. If all cuts are the same depth, put everything on a single layer. Only use multiple layers if you need different depths for different lines. And save as R12 .dxf I did all this and used ACE http://www.dakeng.com and it looks fine in NC Plot. See pic.
Keep in mind that you may need to offset the lines the toolpath radius, depending on the CAM software you're using.