Stone buttons will remain stuck in the depressed position and cannot be pressed again. The issue occurs when a stone button is placed on an iron block directly beneath a command block setup to use the /tp @p x y z command line. When the stone button is removed from the iron block and reattached the stone button will work normally again. Have not experienced the same issue when a stone button is used to activate an iron door, regular, or sticky piston. This issue became present after installing Snapshot 13w03a.