Redstone Torches don't transmit single tick redstone pulses.
Steps to Reproduce:
Normally, when a redstone torch recieves a signal it turns off. If the signal it recieves is stopped for 2 redstone ticks the torch will turn ON for 1 tick. In 1.5 however, the torch now turns on for 2 redstone ticks. They simply don't react to 1 tick changes.
The attached image shows a simple way to reproduce the problem. If the repeater in the back is set to 3 instead of 4, the redstone dust turns off for 1 tick and should allow the redstone torch to turn on for 1 tick. In 1.5 this does not work.
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This broke quite a few contraptions.
Pistons sticky pistons can't toggle the position of a block when they recieve the pulse from a redstone torch.

The redstone torch above the gold block, in 1.4.7 would normally turn on for 1 redstone tick when the buton is pressed. In 1.5 it turns on for 2 ticks. If the repeater in the back is set to 3 instead of 4, the redstone dust turns off for 1 tick and should allow the redstone torch to turn on for 1 tick. In 1.5 this does not work.

Duplicate of MC-6099.