I have installed 2013 and immediately noticed an issue. In 3D views the glass material in any object shows through all other objects. As I rotate the view all glass objects remain visible even if on the opposite side of the building (See screenshot). Note that the windows are in the correct place; they are not "jumping" by nature of some glitch. I found that when I turned the transparency of the glass material to 100% it did disappear, but when I switched the view to realistic they showed up again. This happens in perspective as well as basic 3D views. Any ideas on how to correct this?