>>edges between the wall's faces appear.
Do you mean diagonal edges within the flat surface of the wall? If so, this
may be the result of a boolean operation. Perhaps Ted Boardman can jump in
here. We ran into a similar problem subtracting window openings from a wall.
I'm not certain how Ted finally cleared up the glitch.
Thanks Alan. I don't recall the originator of this thread, but I was guessing
that those may be the "edges" he described. If I see the problem arise again,
I'll remember your tip.