Saved game today, went back in and everything built since last save was lost, HOWEVER my location was the same as when last saved and all items used to build things since last save were consumed.
Also noticed that the 'Downloading terrain" loading screen takes much longer to load than previously. Have tried older version of minecraft, same issue..
Related issues
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[13:13:42] [Client thread/INFO]: Setting user: davionnz
[13:13:42] [Client thread/INFO]: (Session ID is token:9f839dcac8a54944b6650ee2d2018558:c15b0055301149f68d4c1e1279f469d2)
[13:13:43] [Client thread/INFO]: LWJGL Version: 2.9.1
[13:13:44] [Client thread/INFO]: Reloading ResourceManager: Default
[13:13:44] [Sound Library Loader/INFO]: Starting up SoundSystem...
[13:13:45] [Thread-6/INFO]: Initializing LWJGL OpenAL
[13:13:45] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[13:13:45] [Thread-6/INFO]: OpenAL initialized.
[13:13:45] [Sound Library Loader/INFO]: Sound engine started
[13:13:46] [Client thread/INFO]: Created: 512x512 textures-atlas
[13:14:04] [Server thread/INFO]: Starting integrated minecraft server version 1.8.1
[13:14:04] [Server thread/INFO]: Generating keypair
[13:14:04] [Server thread/INFO]: Preparing start region for level 0
[13:14:05] [Server thread/INFO]: Preparing spawn area: 59%
[13:14:06] [Server thread/INFO]: davionnz[local:E:241d77f6] logged in with entity id 16 at (-320.3604282934826, 73.0, 778.1239237710846)
[13:14:06] [Server thread/INFO]: davionnz joined the game
[13:14:16] [Server thread/ERROR]: Chunk file at -13,56 is in the wrong location; relocating. (Expected -13, 56, got -10, 54)
[13:14:17] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 11239ms behind, skipping 224 tick(s)
[13:14:25] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2934ms behind, skipping 58 tick(s)
[13:15:33] [Server thread/INFO]: Saving and pausing game...
[13:15:33] [Server thread/INFO]: Saving chunks for level 'Underground'/Overworld
[13:15:33] [Server thread/INFO]: Saving chunks for level 'Underground'/Nether
[13:15:33] [Server thread/INFO]: Saving chunks for level 'Underground'/The End
[13:15:35] [Server thread/INFO]: Stopping server
[13:15:35] [Server thread/INFO]: Saving players
[13:15:35] [Server thread/INFO]: Saving worlds
[13:15:35] [Server thread/INFO]: Saving chunks for level 'Underground'/Overworld
[13:15:35] [Server thread/INFO]: Saving chunks for level 'Underground'/Nether
[13:15:35] [Server thread/INFO]: Saving chunks for level 'Underground'/The End
[13:15:49] [Server thread/INFO]: Starting integrated minecraft server version 1.8.1
[13:15:49] [Server thread/INFO]: Generating keypair
[13:15:49] [Server thread/INFO]: Preparing start region for level 0
[13:15:50] [Server thread/INFO]: Preparing spawn area: 76%
[13:15:50] [Server thread/INFO]: davionnz[local:E:46a99c76] logged in with entity id 34455 at (146.27250100908202, 46.0, 183.37057217275864)
[13:15:50] [Server thread/INFO]: davionnz joined the game
[13:16:00] [Server thread/INFO]: Saving and pausing game...
[13:16:00] [Server thread/INFO]: Saving chunks for level 'New World'/Overworld
[13:16:00] [Server thread/INFO]: Saving chunks for level 'New World'/Nether
[13:16:00] [Server thread/INFO]: Saving chunks for level 'New World'/The End
java.io.IOException: Stream Closed
at java.io.RandomAccessFile.seek(Native Method)
at bft.a(SourceFile:315)
at bft.a(SourceFile:255)
at bfu.close(SourceFile:236)
at java.util.zip.DeflaterOutputStream.close(Unknown Source)
at java.io.FilterOutputStream.close(Unknown Source)
at bfw.a(SourceFile:163)
at bfw.c(SourceFile:151)
at brn.c(SourceFile:37)
at brn.run(SourceFile:30)
at java.lang.Thread.run(Unknown Source)
[13:16:02] [Server thread/INFO]: Stopping server
[13:16:02] [Server thread/INFO]: Saving players
[13:16:02] [Server thread/INFO]: Saving worlds
[13:16:02] [Server thread/INFO]: Saving chunks for level 'New World'/Overworld
[13:16:02] [Server thread/INFO]: Saving chunks for level 'New World'/Nether
[13:16:02] [Server thread/INFO]: Saving chunks for level 'New World'/The End
[13:16:11] [Client thread/INFO]: Stopping!
[13:16:11] [Client thread/INFO]: SoundSystem shutting down...
[13:16:11] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com

The last save is from another world, which seems to work ok. Id rather not lose all the effort Ive put into the first one!

[13:14:16] [Server thread/ERROR]: Chunk file at -13,56 is in the wrong location; relocating. (Expected -13, 56, got -10, 54)
--> MC-2545
This was fixed in 1.8.1, but only prevents the corruption of chunks after that version. If the chunks were corrupted by previous version, nothing can be done about that.
If that happens again:
Please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".