In my game, some Blocks (16x16 Block-squares, I'm not sure in wich height or depth) changed their place or disapeared.

Put the summary of the bug you're having here

What I expected to happen was...:
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What actually happened was...
In my game, some Blocks (16x16 Block-squares, I'm not sure in wich height or depth) changed their place or disapeared.
I took some screenshots, were it could be seen.

In pic 1 the left square jumped diagonal (corner to corner)
in pic 2 you can see the cut-out trees which opposite can be seen in pic 3 from the backside.
in pic 4 you can see the missing fence and the useless redstone line which jumped away
in pic 5 another spot which changed.
pic 6 on the left the first two spots and in the birch wood the second spot.