UCCNC DXF Layer not selectable

I have a sheet metal part that was created in Autodesk Inventor. When i save the flat pattern as a DXF (Autocad 2004) and then open in UCCNC, I cannot access the interior or outer profile layers. I can see the physical outlines of the part in the run window but if I select the interior profile to run, it will only create a toolpath for the holes I have and not the cutout i need. I have created parts in the past with Inventor and had no problem but for some reason I am having an issue. Any ideas why the Layer are not accessible? Is this a format issue when saving?