So... I tried to make some skylights. Three windows next to each other. The glass is func_brush. Named. Respective names are put in the 'rendered window' dialog of their respective func_areaportalwindows. func_brush is always solid, yada yada. So then, I compile, and I guess the areaportalwindow itsef must have worked because I did not get a leak, but the window itself... Sheesh. While it is technically solid, as in, I can walk on it, bullets go right through it, and when walking on it and crouching, it looks like the player is wobbling up and down something fierce. What did I mess up?