Found a bug for the Light and Dark layouts. When you select one or the other it gives an error:
400 Bad Request
Honey Pot Error (content_field). Request aborted.
But if you hit back, then go in again to save it will work, but then it's selective by showing Dark on some areas, not others. When I went back to Light, same error and I had to go back again to apply it. Now on Forums it goes to the Dark layout, but on posts it shows Light. Other areas it also has Dark stuck, like Profile, and News, but Tutorials doesn't.