dxf or dwg into Altium

I can't seem to get a dxf or dwg into Altium Designer. I've tried multiple file type settings and unit settings. If I choose "model" when importing, the size of the 1" x 1" reports as hundreds of inches, unless I choose "paper." Either way, it won't import. I can bring it into CAM350 and export it out and it will work. Any ideas?