If a dropper or dispenser are placed facing up with a block then placed on the top/exit side of the dropper or dispenser, when activated, the item being ejected from the dropper/dispenser will always go in the WEST direction.

This behavior is NOT seen in 1.7.9. Instead the item will randomly eject in the N/S/E/W directions allowing for it to ALWAYS pass through 1 of 4 separate hoppers enabling the creation of Random Output circuit. I have chained the circuits together in other worlds, assigning each of them command blocks to create a random message generator which chooses from 16 different messages.

The latest snapshots break this behavior.

Attached is a flatworld that shows this behavior.