Nethaera announced today a hotfix that was applied over the holidays last week. There were issues in Lake Wintergrasp, the level 80 realm PvP zone, that prevented "objects" changing factions. This has now been fixed.
This included things like the teleport pads outside the base and several NPCs. Because of this bug people were often times only able to attempt the raid boss once. When the group wiped they went to the teleport pat to zone back in. It didn't work. However now it does, and people can be happy.
This comes from a post entitled "November / December Hotfixes," so we're assuming that there'll be more of them on their way. We'll keep you updated.