When I made a Creative world for me and my friends to make a TNT cannon on, I placed a piece of redstone and it appeared 'Stretched'. Also a Flower Pot appeared to have 'Floating sides' and Lily Pads appeared 'invisible' (except the hitbox).
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) here.
Environment updated and force crash log added.

Duplicate of MC-3718
Can you provide screenshots of each of these?