I'm using windows 7 64 bit, though my friends tested this on other "enviroments" too.
I built an endermen farm with an enderchest at my feet. However, I got stuck somehow. (See picture)
I was expecting to walk straight out like in the previous versions.
What happened however, I got stuck. I tried jumping and sneaking and everything, I just couldn't move.
Steps to Reproduce:
Just build similiar building like in the picture, and get in. You can no longer get out unless you break a block next to you.