U can dupe preassure plates by doing this:
r=redstone p=piston pp=preassureplate
And simply place preassure plates.
Sorry for low quality video
Bug name: Can't play in a world
Details: When i try to play in an existing world the game crashes and i get an error report log on my desktop.If i try to make another world the same thing happens
System:Windows 7, intel i5, 4 gigs of ram, ATI radeon graphics card.
Here is the error log: http://pastebin.com/AVQ3Vde9
Details: I cannot be hurt. I went into the Nether and fell in the lava and did not take any damage. Also I was swarmed by a crowd of zombie pigmen and still took no damage. Furthermore my hunger bar got depleted and i still can't take damage