Oblivion

Confirmed for 1.10.1. If you jump right on the edge of a block, the jump score won't increase.

Confirmed for 1.10.

Can confirm for 1.9 pre-4.

NeunEinser it is not only a visual glitch. If you try to stand on top of the shulker you will start glitching up and down.

This is not a bug. I just can't find a way to delete this post.

Pick Block does the same thing.

Problem solved. ID was the problem. Weird that it worked on 1.8.8 though.

The problem also occurs, if you trigger a summon (item) command while dead. The items don't display visually but you can pick them up after respawn.

Sure

Yes, but he doesn't mention the fact of summoning an item while dead. Otherwise the same.

Bug has been updated. It works in the newest version of Minecraft, pre-3 that is.

Make a fast setblock clock by doing the following:

1. Make a command block with this command in it: /setblock ~ ~-1 ~ redstone_block
2. Put another command block two blocks below the first one and put this command in it: /setblock ~ ~1 ~ air
3. Put a redstone block in the middle. This created a fast clock.

Then do the following:

1. Put a command block with this command next to the redstone block: /execute @p ~ ~ ~ summon FallingSand ~ ~ ~ {Block:stone_slab}
This will spawn a falling sand entity with the block id of a stone slab rapidly to you.
2. Now walk on top of other type of half slabs and notice that they turn into stone slabs.

I hope this cleared things up.