1 - Place a pressure plate on top of a Redstone Lamp (picture)
2 - disconnect from the game while pressing the pressure_plate
3 - return to the map and notice that the pressure_plate keeps activated
Sorry my English by Google translator ;D
Environment
Windows 7 64bits
Can't reproduce.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.