Was digging at y=10 with one other player (2/20) on a multiplayer server. The client crashed while strip mining regular stone blocks.
I'm not positive it's a type casting error, but that's what it looks like.
Environment
Mac OS X (x86_64) version 10.8.2
Java Version: 1.6.0_37, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Duplicate of MC-3339