Java Edition Beta 1.7.2

Beta 1.7.2 is a version of Java Edition Beta released on July 1, 2011, to fix some of the bugs and crashes in Beta 1.7_01.

Fixes

 * 3 bugs fixed
 * Crashed worlds now work again.
 * Disappeared pistons have been fixed.
 * Pistons that caused crashing for multiplayer servers have been fixed.