OS:Windows Vista Home Premium K SP2 32bit
CPU: AMD FX-6100 @ 3.30GHz
java version "1.7.0_15"
Java(TM) SE Runtime Environment (build 1.7.0_15-b03)
Java HotSpot(TM) Client VM (build 23.7-b01, mixed mode, sharing)
Setup like the picture and power the block. then piston arm passes through piston. And sometimes, piston base becomes invisible. (the pistons in picture are sticky.)