Transparent Q menu and other bugs

I’m not sure what caused this, but the Hud and weapon selection do not show up, and the part of the Q menu that is normally gray is completely transparent, making it difficult to read, unless I’m looking straight up or down when I open it. I also have difficulty using the wire expression 2 editor. Some other things that happened were that the words on the main menu have black rectangles around them, and if I open and close the box that opens when you start a single player game it leaves behind a black rectangle. Garry’s mod was running fine a while ago, and I’m not sure what changed.