Can confirm, naturally generated cave spider spawners in a new survival world on my server are never spawning anything despite being in complete darkness.
Yes, I just tested it. Confirmed for 1.8.1-pre4.
I wasn't using a custom resource pack in the video. I still see the bug after confirming only the default resource pack was selected.
The sign still darkens with Advanced OpenGL on.
As requested
Re: Mark Derickson
I disagree. In MC-3208 it says: "When the server is stopped, player positions and the world are saved." This makes it clear that MC-3208 is related to the behavior of the stop command when auto-saving is turned off. It does not mention that the saves continue to occur every five minutes even before the server is stopped.