http://youtu.be/ux6DZIpNkck

The video shows a bug I found last night. A dispenser was firing when it wasn't suppose to. So I created a small video to show it in action.

The first couple of times I click the button, you can hear the dispenser fire when it shouldn't... Then I remove a block and the dispenser stops firing... When I put the block back, the bug happens. If you remove the block from the front of the stickey piston, the dispenser doesn't fire either... It feels like a block update bug.

Its hard to explain, the video shows it well.

Sorry, no mic.