I have a companion file i created using Inventor. Now i need to section it. I've done this before without a problem using very simliar parts, this one is just a different size. It asks me to select a polyline to use for cutline, i select the polyline. then it says, "hidden lines not computed: no eligible objects found." Like I said, i've done this sectioning before without any problems, what the heck is going on?