So, I peeked at your room to look at the walls. The problem is that you have several that aren't tied together (I forget the actual term). Where they should be joined, they are not joined at all. Also, single walls that stick out (drawing a single wall coming out from the exterior room wall) have the tendency to be transparent as well from my experience. If they aren't connected to anything, they vanish, if that makes better sense.
Thanks Raven for your feedback. You mention the problem is my walls were not 'tied together' and not joined. is there a specific procedure or method to make sure they are joined properly and how does one recognize on the drawing plan if they aren't?
Hi Teresa, I gave you the solution on your other Forum post. Corners should look like this / and where 3 walls connect it should look like this Y. When you get anything else they are not connected and they will disappear.