Just to add. The pic below is of one of our working drawing packages. We use the 3d model to generate, per design layer, much of the technical imagery (wall components eg) But we also use a lot of 2d lines symbols etc to complete the technical package. The image on the left is the 2d with the model underneath in 3d, the image on the right is in top plan. That's the way we work. The issue we have with screen plane/layer plane, is that the programme inexplicably switches between layer & screen plane. So you can be working on a group of 2d objects and discover they are in 3d or layer plane because you haven't noticed the switch. If this happens the programme (understandably) thinks they are 3d objects. When they are 3d objects they confuse VW and it often crashes, and produces poor renders with the (2d now 3d) objects in. When you get to the level of working drawings this becomes a real problem, reversable I admit, but very irritating. The most simplistic example I can give is adding section lines to a design layer. When copied they turn into 3d/layer plane, not screen plane on other design layers. I'm rambling. Does this make sense! Just wanted to add this to the discussion.