Put the summary of the bug you're having here
I was using sticky pistons, redstone and redstone recievers to build retractable stairs. When activated the first time, the stairs retracted faster than they did in 1.4.6 , but any attempts to retract the stairs after that failed. The redstone and redstone recievers would activate, but the sticky pistons (with the stairs attatched to them) would not activate.

After the first attempt at retracting the stairs, they should have successfully kept protracting and retracting after that, but they did not. The same problem also occurs with any other use of the pistons.

1. place a sticky piston on a surface.
2. place a lever next to the piston.
3. use the lever.
4. use the lever again (the piston should return to its normal state).
5. use the lever again, and notice that the piston is not functional.