So I was doing the tutorial on making an FPS, and the grid randomly disappeared. Now I can't put anything into the map or it gets and error, "!IsNormalized(dir)UnityEngine.Camera:ScreenPointToRay(Vector3)". Are there any solutions to this?
Thanks.
Just go to the menu Window -> Layouts -> Revert Factory Settings... I still don't know the reason why this happens, but that should fix your problem.