I'm not being showed anything, but if something fucks up at certain camera angles, this is just another Hammer bug. I'm aware of existence of 3 such bugs, 1 consisting of disappearing brushes, another of the view in general going fubar and the third occurs when a texture in the scene is being transformed through VMT (like the 45° gridlike glass) and in the Textured Shaded mode, consisting of other textures being transformed as well. Such a ton of info because the image is broken, at least for me.