The redstone on the right in the picture is connected to a button, whenever I hit that button it pulses the dispenser several times rather than just activating it once. This wasn't true as recently as 13w02b, and it mess up a lot of systems involving dispensers.
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Duplicate of MC-6077, please use the search function to see if your bug has already been submitted. Currently over 45% of tickets are being closed as duplicate.

This isn't the same bug at all. This bug causes it to update things behind it. The other 'bug' is useful, I like it, I hope it stays as a feature, this bug causes dispensers not to work when you want to have a system that only fires if it's so full or what have you.