In some situations, Revit 2013 may improperly display and print (raster output, PDF, paper) shaded/rendered 3D views - windows and other transparent or glass elements are displayed even on hidden parts of the building. So the solid walls appears to be semi-transparent, see-through, glass-like:
The source of this problem is an incompatibility of your graphics card, or its driver. Try to update your gr.card Windows driver, make sure you are using an Autodesk-certified graphics card (accelerator). If your card is not compatible, disable its hardware acceleration in Revit (Options > Graphics).
You can also try to enable the "Photographic Exposure" mode in Realistic views (see "Graphic display options" in the 3D view properties):
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Please use these tips at your own risk. CAD Studio (Xanadu) is not responsible for possible problems that may occur as a result of using any of these tips.
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