I've literally spent hours trying to make those lines go away. Deleting walls, adjusting wall surfaces, you name it. I'm doing the final renderings for the layout and can't have them in it. I agree with Erichk1 that there should be a better answer, but on the other hand I have a $600 program that works 90% as well as other >$2,000 programs, so I guess you have to put up with some things that don't work as well as you would like.