When a torch is placed on the bottom of any solid block (Diamond Block, Glass, etc.) adjacent to a valid block a torch could be normally placed on (Gold Block, Etc.), the torch is orientated as if it is on top of a block. When the torch is updated, the torch breaks.
Environment
Dell XPS Studio PC
Windows Vista SP1 x64 Bit
JRE 7 x64 Bit
Single Player
MC-56941