I have no idea WTH is happening to minecraft.

I was just happily playing minecraft working on my new Mob Arena. Then I felt like showing my dad the awesome new rendering system Mojang added. (BTW great job!) then I told him about the lighting bug where everything stays lit. After doing that I showed him how I can run minecraft at 32 Render Distance at a good FPS now then something odd happened. The world did not want to render leaving me with some very scaring things, the game almost looks corrupted. (look at images) I had to close the game entirely and re-open it to fix the problem. Please be quick and update a new snapshot to fix this stuff.