I created a large structure in the nether, left the nether and logged off. Logged on Later and entire nether has reset (to an earlier save?) and the Structure was completely gone and most of the nether had regenerated (Although my Inventory and the overworld was the same as I left it with items mined out from the nether that had been reset) . No Idea what caused it, since just logging off and logging in normally does nothing to the save/world.
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There was no client instability/crashes, just the nether dimension reset to a much earlier state from about a week before, but the overworld did not.
Then please attach the development console of the time as that happens, either current console or [minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/logs/<date>.log.gz
Nothing to see in the logfiles:
[00:02:36] [Server thread/INFO]: Saving and pausing game...
[00:02:36] [Server thread/INFO]: Saving chunks for level ':P'/Overworld
[00:02:36] [Server thread/INFO]: Saving chunks for level ':P'/Nether
[00:02:36] [Server thread/INFO]: Saving chunks for level ':P'/The End
[00:23:33] [Server thread/INFO]: Saving and pausing game...
[00:23:33] [Server thread/INFO]: Saving chunks for level ':P'/Overworld
[00:23:33] [Server thread/INFO]: Saving chunks for level ':P'/Nether
[00:23:33] [Server thread/INFO]: Saving chunks for level ':P'/The End
[00:31:09] [Server thread/INFO]: Saving and pausing game...
[00:31:09] [Server thread/INFO]: Saving chunks for level ':P'/Overworld
[00:31:09] [Server thread/INFO]: Saving chunks for level ':P'/Nether
[00:31:09] [Server thread/INFO]: Saving chunks for level ':P'/The End
[00:32:17] [Server thread/INFO]: Stopping server
[00:32:17] [Server thread/INFO]: Saving players
[00:32:17] [Server thread/INFO]: Saving worlds
[00:32:17] [Server thread/INFO]: Saving chunks for level ':P'/Overworld
[00:32:17] [Server thread/INFO]: Saving chunks for level ':P'/Nether
[00:32:17] [Server thread/INFO]: Saving chunks for level ':P'/The End
[10:10:42] [main/INFO]: Setting user: TheSirusKing
[10:10:42] [main/INFO]: (Session ID is token:9d2be64903d143bb9a24d7e2fc0a181d:655b1565abce4b4388f8d47256d92740)
[10:10:43] [Client thread/INFO]: LWJGL Version: 2.9.0
[10:10:44] [Client thread/INFO]: Reloading ResourceManager: Default
[10:10:44] [Sound Library Loader/INFO]: Sound engine started
[10:10:45] [Client thread/INFO]: Created: 1024x512 textures/blocks-atlas
[10:10:46] [Client thread/INFO]: Created: 256x256 textures/items-atlas
[10:10:51] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:10:57] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:11:10] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:11:27] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:11:28] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:11:56] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:12:03] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:12:22] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:12:30] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:12:56] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:music.menu
[10:13:22] [Server thread/INFO]: Starting integrated minecraft server version 1.7.2
[10:13:22] [Server thread/INFO]: Generating keypair
[10:13:22] [Server thread/INFO]: Preparing start region for level 0
[10:13:23] [Server thread/INFO]: Preparing spawn area: 85%
[10:13:24] [Server thread/INFO]: TheSirusKing[local:E:393173b8] logged in with entity id 274 at (436.31883751702003, 133.0, 150.30000001192093)
[10:13:24] [Server thread/INFO]: TheSirusKing joined the game
[10:13:26] [Server thread/INFO]: Saving and pausing game...
[10:13:26] [Server thread/INFO]: Saving chunks for level ':P'/Overworld
[10:13:26] [Server thread/INFO]: Saving chunks for level ':P'/Nether
[10:13:26] [Server thread/INFO]: Saving chunks for level ':P'/The End
[10:14:16] [Server thread/INFO]: TheSirusKing fell from a high place
[10:14:16] [Client thread/INFO]: [CHAT] TheSirusKing fell from a high place
[10:16:13] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:step.anvil
[10:16:13] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:step.anvil
[10:16:39] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:step.anvil
[10:16:39] [Client thread/WARN]: Unable to play unknown soundEvent: minecraft:step.anvil
[10:27:19] [Server thread/INFO]: Saving and pausing game...
[10:27:19] [Server thread/INFO]: Saving chunks for level ':P'/Overworld
[10:27:19] [Server thread/INFO]: Saving chunks for level ':P'/Nether
[10:27:19] [Server thread/INFO]: Saving chunks for level ':P'/The End
[10:29:17] [Client thread/INFO]: Warning: Clientside chunk ticking took 137 ms
[10:29:23] [Client thread/INFO]: Warning: Clientside chunk ticking took 110 ms
[10:30:04] [Client thread/INFO]: Warning: Clientside chunk ticking took 141 ms
[10:32:56] [Server thread/INFO]: Saving and pausing game...
[10:32:56] [Server thread/INFO]: Saving chunks for level ':P'/Overworld
[10:32:56] [Server thread/INFO]: Saving chunks for level ':P'/Nether
[10:32:56] [Server thread/INFO]: Saving chunks for level ':P'/The EndAs I said previously, nothing unusually and no Client instability. Earlier, I completely reset (deleted the file) the nether, but just now about 20 minutes ago the nether has reset again.
Please attach the complete output of the "Development console" tab of the launcher.
Click the text, press CTRL-A to select all, then CTRL-C to copy, and CTRL-V to paste in a comment on this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".