/fill breaks everything even when you specified blocks

Can't ride a "MinecartRideable riding a MinecartChest"

Tick Issue, Since 14w31a Until Minecraft 14w32d

Pick Block of New Doors will give you Oak Door

Chunk Delay (Grass,Tall Grass)

Wild Empty Water Block

Placing a Comparator will be facing relatively to your position

Placing an Oak Log will result to crash

Spamming /fill on a command block gives a huge spike lag

Unknown Redstone Block Texture

/worldboarder won't let you move

Hopper Problem

Minecart with furnace moves without coal

Can't use @p[type=Player] {SelectedItemSlot:0} as a target

Adventure Mode