I'm out at my wither skele farm on SMP3. I've discovered that my sticky pistons have stopped working properly. In some instances, they won't push a block when activated but will extend when the block in front of the piston is removed. In all cases, the piston won't pull the block in front of it back when it retracts. This just started today, and appears to be affecting hundreds of sticky pistons at my farm. I built a test setup using a single sticky piston and verified that the problem exists with new placements of a piston as well as the existing pistons.