Pistons are disappearing after placed. There is an invisible block that you can walk through in their place. They make the appropriate particles when broken. This may be related to the pistons staying on bug I reported earlier, but I am not sure. The piston rod will not extend.
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Your Java version is ancient! Please update your Java to the latest version: http://www.java.com/en/download/ .
When using a 32-bit browser on a 64-bit operating system the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp .
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt) here.Please attach screenshots.