Here is the plan view of the two knee walls, with that attribute checked in the wall specification dbx.
Here is the perspective view of the knee walls protruding through the roof.
My first remedial action was to go to elevation view and drag the walls down below the roof line. After doing this I still have some remenants remaining, like Groucho's eyebrows, above the dormer, looking like this:
When I go to elevation view and click on the thin line (representing this feature) the program is telling me that I've clicked on a room.
What feature of the room is this, why does it protrude through the roof and how do I remove it? Using X6.
Thanks for any help.
Bonus question: Lately I've been noticing that an orange colored distortion effect is appearing on my roof planes in perspective view, you can see a bit of it in photo #2. It comes and goes, as I move the camera around and appears all over the roof rather than being locked into one spot.