While holding "alt" and rotating the camera to the left or right, produces a graphical glitch. This only happens at the max rotation in both directions. Any degree lower than the max will not produce the effect. This has only been produced within 1st person camera view. When the bug occur I was in a 1st person only server. Please see screenshots included. I also included screenshots when the rotation was not at the max to demonstrate the conditions needed to produce the visual glitch.