A piston powered by a redstone torch placed directly above it does not retract even if the torch is in the off state, and doesn't update unless the torch is destroyed unless the torch is destroyed. This occurred in both singleplayer and multiplayer in 1.6.2
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210+ Duplicate of MC-108, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being resolved as duplicate.