While trying out the new snapshot I noticed that pistons seemingly randomly got stuck in extended position. With this I don't mean the usual "bug" exploited by several BUD-switches. In this case one could destroy all blocks around (I destroyed all blocks in a radius of 3 around them) place and remove blocks adjacent, power them and then remove the power source, ... there was seemingly no way to retract it, once stuck. I also could not make out any pattern which situation may cause this bug. Seemed to be completely random.
Edit 9th January 2013 9:40 AM:
Managed to recreate the issue! Posted screeshots how to recreate it!
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Duplicate of MC-127.
not entirely sure this is really a duplicate of MC-127 as the SAME pistons (same world, same setup) work perfectly flawless in 1.4.6 and 1.4.7 only when I tried out the new snapshot in order to test how the redstone update would affect my redstone circuits the pistons suddenly started bugging out. So, at least this variation of the stuck pistons bug is definitely new in the snapshot 13w01b! (and completely breaking several of my mechanisms 😞 ). Also in contrast to MC-127's description, this is not only a visual bug. These stuck pistons stop working at all. They have a complete physical hitbox, you can stand on; you can repower and remove power withtout any change of state and they are also not moveable by other pistons ... so, well not really sure these are the same issues :/
All piston bugs related to a piston beeing extended and retracted at the same time are summarized in MC-127.
Please provide some screenshots.