When you are underneath an upside-down stair, and you go into third person, the world is unable to be seen, and there is instead some sort of black effect blocking you from seeing the world.

Steps to Reproduce:
1. Place an upside-down stair in a spot where the player can crouch under it.
2. Couch and go underneath the block in third person, and the screen should mostly go black.

Note: This occurs if it's third person back or front, but doesn't occur when in first person.