Zen Gold

This is possibly the iron golem particle crash. Is there any iron golem around?

I think he meant that you cannot edit a page without deleting up to that point

Basically, it's not that he can't move the player backward, it's that he can't move the text cursor backward

This is a feature that was recently added.

"Slimes now spawn in Swamp biomes at low light level"

Are you using optifine? There's an option that allows you to have rotated natural blocks and everytime I've seen this, this was the culprit. If you look closely at the screenshot, you can see that some of the stone and gravel blocks are also rotated.

That's incorrect, Mustek. You can obtain that block with a simple use of the in-game "/give" command

I've had this happening on my rail with only 1 block under it. Each time the FPS goes near 0 (Because the game needs to load chunks and my computer is not really good at it), I take damage. What I think happens is that the game thinks the player "falls" into the 1 block below the track (Because when you are in a minecart, you are slightly inside the block below you) and you take suffocation damage because of that. I believe a temporary solution for this would be to have 2 blocks below the track because that 2nd block should stop your "fall", so your head should never go through the 1st block.

Confirmed. My workaround is to switch the selected item to something else so that it interrupts the eating process.