Andrew Merrell

I find that if I'm "protecting" the campfire with a trapdoor or carpet, they get angry, but if I destroy it (not simply toggle the door open) then the seem fine, though the campfire is 3 blocks below.

I think what's happening is that the logic is looking for just a campfire below the hive.  
I propose adding logic to skip "smoke through" blocks when checking blocks below.

There's a fix on reddit here:
http://www.reddit.com/r/Minecraft/comments/1wuaiv/amd_141_beta_drivers/

You updated your AMD driver to their new beta, didn't you?

13.12 works
14.1 breaks it
14.1 with the above fix, makes it work...