I have what I want now in the third image. Before you pointed me in the direction of the foreground photo checkbox, I couldn't find a way to get my modification displayed over the top of the photo. Now I can. Thanks for your help. Julian

@dave r said: Do you have something at a long distance from the origin? Hit Zoom Extents with shadows off and show us a screen shot. Zooming to extents fills the window with the building. With shadows on, the building disappears completely, but switching shadows off brings it back. So, nothing at a long distance from the origin. Julian

Thanks. It's always helpful to know the underlying reasons. I'll try exporting to a 2D image at high resolution when I need to print. Julian

I hope you don't mind if I say that this model is a complete mess (seriously, I don't mean any personal). Actually not only some (but many) of the rear and some of the front windows are also see-through (only from that angle it's not apparent). For some reason, all your window components contain another window component. Exploding the outside ones make all the inside ones see through. I wonder which component has gluing/cutting features and which is cutting what... (although you have all the window openings cut into the walls anyway). So my guess is that there's something with the "cut opening" feature but seriously speaking there are sooo many components nested into each other that I can't really investigate which is which and which is causing the problem. For this particular project, I'd suggest a "workaround". There are two styles in your file now that I created. One is in monochrome mode with transparency turned off and one is the shaded with texture mode with transparency turned on. Use the styles dialogue to change the rendering modes instead of the buttons in the toolbar. Also purged the model a bit... Hope didn't delete some components you were going to use later 7 Nightingale Rd Extension 30 var.skp

I installed the fix and it now works fine. Thanks very much. Julian