Minecraft Crashes When Opening a World

When I log into Minecraft, hit Singleplayer and double-click on any world, it looks like it is loading for a few seconds, then crashes. No crash report is generated. All that I have is the Development Console spewing:

[17:22:36 INFO]: Client> Invalid memory access of location 0x7fd71c4ec849 rip=0x11d9aee03
[17:22:36 ERROR]: java.io.IOException: Stream closed
[17:22:36 ERROR]: Game ended with bad state (exit code 139)
[17:22:36 INFO]: Deleting /Users/MyUserName/Library/Application Support/minecraft/versions/1.7.4/1.7.4-natives-1391563345064849000
[17:22:36 INFO]: Ignoring visibility rule and showing launcher due to a game crash

Restarted my computer to no avail. Reinstalled Minecraft, even wiped Application Support/minecraft. Did not work. This happens on every version from 1.7.4 to the latest snapshot. It started happening one day when I was playing Minecraft, not doing anything abnormal, and then it just crashed. Now it will not work. Again, opening any world at all, even a new one crashes Minecraft.

I honestly don't know what to do… I would think that wiping Minecraft off my computer completely and utterly would have fixed it, but it didn't...