Create a world in 1.7.4 and place paintings on structures, now load the world in snapshot 14w04b. Notice how the paintings all get destroyed upon loading the world, but when loaded in 1.7.4 they stay.
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I have the same problem, Mojang has apparently changed the way of placing paintings on blocks. Now, the vertical axis of symmetry of the painting is placed in the center of the block on where it is placed.
Maybe caused by MC-45762