When I generate a new world in 1.9 in either survival or creative, the blocks around me change constantly. The whole world changes constantly from blocks to lava to mobs to villages etc. It won't stop changing. If I press F3 the blocks aren't actually changing, they just appear to be.
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This almost sounds like whats happening in this vid. https://www.youtube.com/watch?v=YnuVaUj_oNw