Last edited by Cad64; 24th Apr 2012 at 08:34 pm. Reason: Added Quote
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Ok, I've taken a look at your file. What you need to do is rotate your glass plane 180 degrees. It's facing the wrong way. You're looking at the back of it in the render.
Another option would be to open up the Arch & Design glass material "Advanced Rendering Options" and put a check in the "Back Face Culling" box. This will allow you to have the material applied to both sides of the plane.