I created numerous new worlds and tried to update my old worlds after purchase. The updates would save on ocasion, but the majority of the time, I would be in the location I quit playing last time and all the blocks I removed were back and all the blocks I placed were gone.
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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"
Refreshing local version list...
Launcher 1.2.5 (through bootstrap 5) started on windows...
Current time is Sep 25, 2013 5:44:50 PM
System.getProperty('os.name') == 'Windows 8'
System.getProperty('os.version') == '6.2'
System.getProperty('os.arch') == 'x86'
System.getProperty('java.version') == '1.7.0_40'
System.getProperty('java.vendor') == 'Oracle Corporation'
System.getProperty('sun.arch.data.model') == '32'
Refreshing remote version list...
Refresh complete.
Loaded 1 profile(s); selected 'Raistlyn215'
Refreshing auth...
Logging in with access token
Delta time to compare resources: 5712 ms
Download job 'Resources' skipped as there are no files to download
Job 'Resources' finished successfully
Getting syncinfo for selected version
Queueing library & version downloads
Download job 'Version & Libraries' started (8 threads, 19 files)
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\14.0\guava-14.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.0\lwjgl-platform-2.9.0-natives-windows.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\argo\argo\2.25_fixed\argo-2.25_fixed.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading C:\Users\Raistlyn215\AppData\Roaming\.minecraft\versions\1.6.4\1.6.4.jar for job 'Version & Libraries': Used own copy as it matched etag
Job 'Version & Libraries' finished successfully
Launching game
Looking for old natives to clean up...
Unpacking natives to C:\Users\Raistlyn215\AppData\Roaming\.minecraft\versions\1.6.4\1.6.4-natives-168072641730612
Launching in C:\Users\Raistlyn215\AppData\Roaming\.minecraft
Running C:\Program Files (x86)\Java\jre7\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -Djava.library.path=C:\Users\Raistlyn215\AppData\Roaming\.minecraft\versions\1.6.4\1.6.4-natives-168072641730612 -cp C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\argo\argo\2.25_fixed\argo-2.25_fixed.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\14.0\guava-14.0.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\Raistlyn215\AppData\Roaming\.minecraft\versions\1.6.4\1.6.4.jar net.minecraft.client.main.Main --username Raistlyn215 --session token:4b0b6dc7543d443b9194c5d55aa09145:cc90c858fe794804b0b233b0289cb86e --version 1.6.4 --gameDir C:\Users\Raistlyn215\AppData\Roaming\.minecraft --assetsDir C:\Users\Raistlyn215\AppData\Roaming\.minecraft\assets --width 854 --height 480
Client> 2013-09-25 17:46:09 [CLIENT] [INFO] Setting user: Raistlyn215
Client> 2013-09-25 17:46:09 [CLIENT] [INFO] (Session ID is token:4b0b6dc7543d443b9194c5d55aa09145:cc90c858fe794804b0b233b0289cb86e)
Client> 2013-09-25 17:46:11 [CLIENT] [INFO] LWJGL Version: 2.9.0
Client> 2013-09-25 17:46:14 [CLIENT] [INFO] Reloading ResourceManager: Default
Client>
Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client> (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client>
Client> 2013-09-25 17:46:50 [SERVER] [INFO] Starting integrated minecraft server version 1.6.4
Client> 2013-09-25 17:46:50 [SERVER] [INFO] Generating keypair
Client> 2013-09-25 17:46:55 [SERVER] [INFO] Preparing start region for level 0
Client> 2013-09-25 17:46:56 [SERVER] [INFO] Preparing spawn area: 10%
Client> 2013-09-25 17:46:57 [SERVER] [INFO] Preparing spawn area: 33%
Client> 2013-09-25 17:46:58 [SERVER] [INFO] Preparing spawn area: 65%
Client> 2013-09-25 17:46:59 [SERVER] [INFO] Preparing spawn area: 83%
Client> loading single player
Client> 2013-09-25 17:47:00 [SERVER] [INFO] Raistlyn215[/127.0.0.1:0] logged in with entity id 224 at (220.4402496435714, 43.0, 269.3651592027951)
Client> 2013-09-25 17:47:00 [SERVER] [INFO] Raistlyn215 joined the game
Client> Setting up custom skins
Client> 2013-09-25 17:47:03 [SERVER] [WARNING] Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-09-25 17:48:10 [SERVER] [INFO] Saving and pausing game...
Client> 2013-09-25 17:48:10 [SERVER] [INFO] Saving chunks for level 'New Village'/Overworld
Client> 2013-09-25 17:48:10 [SERVER] [INFO] Saving chunks for level 'New Village'/Nether
Client> 2013-09-25 17:48:10 [SERVER] [INFO] Saving chunks for level 'New Village'/The End
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Raistlyn215 lost connection: disconnect.quitting
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Raistlyn215 left the game
Client> java.io.IOException: Stream Closed
Client> at java.io.RandomAccessFile.seek(Native Method)
Client> at aeb.a(SourceFile:308)
Client> at aeb.a(SourceFile:251)
Client> at aec.close(SourceFile:232)
Client> at java.util.zip.DeflaterOutputStream.close(Unknown Source)
Client> at java.io.FilterOutputStream.close(Unknown Source)
Client> at aee.a(SourceFile:140)
Client> at aee.c(SourceFile:128)
Client> at ams.b(SourceFile:30)
Client> at ams.run(SourceFile:23)
Client> at java.lang.Thread.run(Unknown Source)
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Stopping singleplayer server as player logged out
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Stopping server
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Saving players
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Saving worlds
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Saving chunks for level 'New Village'/Overworld
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Saving chunks for level 'New Village'/Nether
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Saving chunks for level 'New Village'/The End
Client> 2013-09-25 17:48:19 [SERVER] [INFO] Starting integrated minecraft server version 1.6.4
Client> 2013-09-25 17:48:19 [SERVER] [INFO] Generating keypair
Client> 2013-09-25 17:48:21 [SERVER] [INFO] Preparing start region for level 0
Client> 2013-09-25 17:48:22 [SERVER] [INFO] Preparing spawn area: 42%
Client> 2013-09-25 17:48:23 [SERVER] [INFO] Preparing spawn area: 61%
Client> loading single player
Client> 2013-09-25 17:48:25 [SERVER] [INFO] Raistlyn215[/127.0.0.1:0] logged in with entity id 12005 at (224.0519942209797, 67.0, 271.69999998807907)
Client> 2013-09-25 17:48:25 [SERVER] [INFO] Raistlyn215 joined the game
Client> Setting up custom skins
Client> 2013-09-25 17:48:30 [SERVER] [WARNING] Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-09-25 17:48:33 [SERVER] [INFO] Saving and pausing game...
Client> 2013-09-25 17:48:33 [SERVER] [INFO] Saving chunks for level 'New Village'/Overworld
Client> 2013-09-25 17:48:33 [SERVER] [INFO] Saving chunks for level 'New Village'/Nether
Client> 2013-09-25 17:48:33 [SERVER] [INFO] Saving chunks for level 'New Village'/The End
Client> 2013-09-25 17:48:34 [SERVER] [INFO] Raistlyn215 lost connection: disconnect.quitting
Client> 2013-09-25 17:48:34 [SERVER] [INFO] Raistlyn215 left the game
Client> 2013-09-25 17:48:34 [SERVER] [INFO] Stopping singleplayer server as player logged out
Client> 2013-09-25 17:48:34 [SERVER] [INFO] Stopping server
Client> 2013-09-25 17:48:34 [SERVER] [INFO] Saving players
Client> 2013-09-25 17:48:34 [SERVER] [INFO] Saving worlds
Client> 2013-09-25 17:48:34 [SERVER] [INFO] Saving chunks for level 'New Village'/Overworld
Client> 2013-09-25 17:48:35 [SERVER] [INFO] Saving chunks for level 'New Village'/Nether
Client> 2013-09-25 17:48:35 [SERVER] [INFO] Saving chunks for level 'New Village'/The End
Client> 2013-09-25 17:48:37 [CLIENT] [INFO] Stopping!
Client>
Client> SoundSystem shutting down...
Client> Author: Paul Lamb, www.paulscode.com
Client>
Game ended with no troubles detected (exit code 0)
Following visibility rule and showing launcher as the game has ended
Deleting C:\Users\Raistlyn215\AppData\Roaming\.minecraft\versions\1.6.4\1.6.4-natives-168072641730612
Couldn't delete C:\Users\Raistlyn215\AppData\Roaming\.minecraft\versions\1.6.4\1.6.4-natives-168072641730612 - scheduling for deletion upon exit

Nothing to see in the console.
Can you ZIP or 7Z one of your not working worlds and attach it here ?
I can see if I can. I'm not that familiar with how to ZIP files and such. It also apparently hasn't saved and downloaded, so I will do that too...
sorry i took so long to get this up for you

Do you close the game or use "Save & Quit to title" ?
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Raistlyn215 lost connection: disconnect.quitting
Client> 2013-09-25 17:48:11 [SERVER] [INFO] Raistlyn215 left the game
Client> java.io.IOException: Stream Closed
Client> at java.io.RandomAccessFile.seek(Native Method)
Client> at aeb.a(SourceFile:308)
Client> at aeb.a(SourceFile:251)