Put the summary of the bug you're having here

What I expected to happen was...:
For the game to load up my saved world. Ever since the very first 1.9 pre-release snapshots started to come out, my game has been acting weird (Slow to load chunks, graphical glitches where my whole screen looks like a minecraft world version of tv static, etc). Most of these issues were really not that big a deal for me and could be fixed by reloading the game. I assumed that this crash was just another minor game glitch created by my computers lack of graphics performance.

What actually happened was...:
Every time I attempt to load up my world, the game begins to slowly load in the chunks and MAY allow me to start moving around a bit (usually less than 20 blocks), but within 30 seconds or so the game crashes completely. This happens consistently for me. It has never done this (the crashing) in any of the previous snapshots before.

Steps to Reproduce:

I don't think there is anything I can put here... The attachment is what I see after my game crashes. I'm not sure if it will help out at all... My world is all vanilla too.