I imported a 2-d autocad dwg, and used it as an outline. I created the walls, windows, stairs, etc in 3-D. All of the walls are transparent in 3-D view. I can't paint them. I looked at the materials properties, and even edited the walls to add a layer of "wood planks". Still transparent in 3-d. Lines appear grey on all of the walls.
In the elevations, the walls are opaque, but I still can't apply paint to them.
It looks as though when I imported the 2-d drawing at the start, I must have imported some parameters that messed up the Revit dwg(?). None of the properties windows under 3-D view seem to help.
Any idea what I could try?
Dwg too big to attach here.