Anyways, I probably want some more awesome content, and maybe add some form of kart racing like Mario Kart by using Pigs with Saddles and a Carrot on a Stick.
I like the new stuff, I really never liked Alpha or Beta, I wanted a more mature game -- that had enough to keep me occupied, during the time without creative, I often used Classic for creating things.
I do believe this is a hitbox trouble, more than likely introduced in 1.3.1, since water was able to suffocate you.
It might be down to the spawning algorithm, or perhaps something else, I had this too, since my character jiggles about for sometime until I break the block under me.