Hi Toolman, I use mastercam & prototracks at work. We have some computers set up with MC8, some with MC9. We also have some MX2 & AGE 3 prototracks. I'm not sure what the M3 control is. MX2 is nice for contours, pockets, & drilled hole patterns where you control the Z-Axis. (quill or knee)we have two 3 axis mills. One is what they call
2 1/2 axis machining. It will drill holes, or step down your depth of cut, but will not cut an X-Z or Y-Z direction. therefore it won't cut surfaces. I'm not sure what a swept 2d toolpath is, but if it is a surface toolpath that may be the problem. Our other prototrak is a true 3D mill & we can cut complex surface or solids shapes, so it may depend on what your version of prototrack M3 has. Another problem may be the post. Are you sure it is the correct post to use, & are you sure it isn't corrupted?