There is a large and long path of darkness across the world.
Entering the area does not fix it like it does with the other darkness glitch.
Lighting with torches makes it look like lighting torches at night, rather than it resetting to "daytime" lighting. 

When I took screenshots, the game crashed. When I go to log back in, it says "the game is already running, do I want to start anyway?"
When I go back to the world, lighting is now correct, but this is still a possible bug with the snapshot.