So today my World (LEW) crashed during loading and after successfully loaded my          World (LEW) this big void was created, it destroyed my item sorter storage building along with my zombie spawn. Lucky that i have kept backup or else i was doomed. FYI it happened to two of my worlds this year (the void). Also i would like to add up that when playing Minecraft            online (for achievements) it crashed so much that i have to play offline.