I cannot break any furnaces or crafting tables placed by me and/or other players in Multiplayer 14w30c. In Singleplayer, I can. I don't no what is wrong is it the server or Minecraft itself. I think you can fix that, Mojang.
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It isn't I couldn't see any other blocks if I break them. and i don't hear the wood breaking/stone breaking sound, if I do F3 + A to rerender it's still there, if a relog it's not in my inventory or the ground.

I once had a bug like that that only affect non-op'd players around the world spawn. Does it still happen if you travel a hundred blocks or more?

It happens in Spawn, anywhere really, I'm not op'd but I can definitely say that even admins or mods or even the owner himself experienced the bug.. I don't know the problem.

I have no issues with that on a 14w31a server

I posted the thread on 14w30c so now no problem 🙂
Are you sure the block aren't just visibly still there? Can you walk through them? Could be a duplicate of MC-62166