This has happened to me in a world that was generated in one of the first snapshots. It happens to other players but few as bad as me. Seems I made a poor choice in chunks, though as you can see, I've had the whole nether go dark as well. There are huge dark spots in our nether.
Following the instructions to refresh the cached files made the problem worse. The refreshed light sources never stay lit, they will go dark again.
This has happened to me in a world that was generated in one of the first snapshots. It happens to other players but few as bad as me. Seems I made a poor choice in chunks, though as you can see, I've had the whole nether go dark as well. There are huge dark spots in our nether.
Following the instructions to refresh the cached files made the problem worse. The refreshed light sources never stay lit, they will go dark again.