i was doing some funny stuff with the new redstone block when i suddenly encountered a way to totally remove the redstoneblock.
reproduce: start off with creating the setup as shown in the image: 2013-02-09_12.49.34
then place redstone wire on top of the block, and it will disappear all the sudden.
the other screenshot shows exactly what happens, the redstone block instantly gets pushed away by the next piston, and then it is gone.
other notable bugs: when you wouldnt use this quartz block and would keep the wires on 1 layer the redstoneblock will be moving around in circles(as expected) but the wires wont be powered, while without the wires it wont move around(or atleast it didnt when i tried). Even more strange is that when i make a screenshot while the redstone block is moving around, it disappears aswell(this is with the redstone wire on the same level, as shown in my last screenshot, after this screenshot the redstone block had disappeared aswell)