A game (seed BarbieGirlBarbieWorld) was created, quickly saved saved, and Minecraft closed. At a later time the game was reopened. After no more than 30 seconds, the game crashed while I was attempting to chop a tree block.
Environment
OSX Lion
java version "1.6.0_43"
Java(TM) SE Runtime Environment (build 1.6.0_43-b01-447-11M4203)
Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01-447, mixed mode)
Duplicate of MC-12369.