When I flew up in the air while looking at a piston that was on a fast clock, it disappeared every now and then. Also, when more than 5 or 6 blocks away from a piston moving (at any speed), it will appear still.
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Cannot reproduce. Piston stays visible.
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.
Your Java version is out of date. Please update your Java to the latest version: http://www.java.com/en/download/ . Keep in mind that when using a 32-bit browser on a 64-bit OS 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 .
Your graphics card driver may be outdated too.
Please report if the issue persists with the latest Java version / graphics card drivers, please attach a new crash report.
Please attach screenshots.