*What I expected to happen was to load the world.
*What actually happened was it crashed.
*Steps to Reproduce:
1. Starting the singel player world menu
2. trying to open the world
3. it crashed.
Environment
OS: Mac OS X (ver 10.9.2, arch x86_64)
Java: 1.6.0_65 (by Apple Inc.)
Launcher: Minecraft Launcher 1.3.11 (bootstrap 5)
Minecraft: 1.7.5 (updated Wed Feb 26 04:22:17 EST 2014)
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