Save glitch

How are you exiting? Are you save-and-quitting or are you force quitting Minecraft?

Doesn't matter. Does it Either way.

Unable to reproduce. Console output says it has always saved my changes:

Client> 2013-05-19 03:26:16 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:26:16 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:26:16 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:26:16 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:26:17 [SERVER] [INFO] Stopping server
Client> 2013-05-19 03:26:17 [SERVER] [INFO] Saving players
Client> 2013-05-19 03:26:17 [SERVER] [INFO] Saving worlds
Client> 2013-05-19 03:26:17 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:26:20 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:26:20 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:26:23 [SERVER] [INFO] Starting integrated minecraft server version 13w19a
Client> 2013-05-19 03:26:23 [SERVER] [INFO] Generating keypair
Client> 2013-05-19 03:26:24 [SERVER] [INFO] Preparing start region for level 0
Client> 2013-05-19 03:26:25 [SERVER] [INFO] Preparing spawn area: 50%
Client> 2013-05-19 03:26:26 [SERVER] [INFO] Preparing spawn area: 87%
Client> loading single player
Client> 2013-05-19 03:26:26 [SERVER] [INFO] Tails_D[/127.0.0.1:0] logged in with entity id 32557 at (-294.39275561811303, 68.0, 104.19035908900253)
Client> Setting up custom skins
Client> 2013-05-19 03:26:28 [SERVER] [WARNING] Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-05-19 03:26:28 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:26:28 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:26:28 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:26:28 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> setting leash holder to nk['entity.LeashKnot.name'/32813, l='MpServer', x=-290,50, y=71,50, z=59,50]
Client> setting leash holder to nk['entity.LeashKnot.name'/32814, l='MpServer', x=-290,50, y=70,50, z=59,50]
Client> setting leash holder to nk['entity.LeashKnot.name'/32815, l='MpServer', x=-290,50, y=69,50, z=59,50]
Client> 2013-05-19 03:26:38 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:26:38 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:26:39 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:26:39 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:26:39 [SERVER] [INFO] Tails_D lost connection: disconnect.quitting
Client> 2013-05-19 03:26:40 [SERVER] [INFO] Stopping singleplayer server as player logged out
Client> 2013-05-19 03:26:40 [SERVER] [INFO] Stopping server
Client> 2013-05-19 03:26:40 [SERVER] [INFO] Saving players
Client> 2013-05-19 03:26:40 [SERVER] [INFO] Saving worlds
Client> 2013-05-19 03:26:40 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:26:41 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:26:41 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:26:50 [SERVER] [INFO] Starting integrated minecraft server version 13w19a
Client> 2013-05-19 03:26:50 [SERVER] [INFO] Generating keypair
Client> 2013-05-19 03:26:51 [SERVER] [INFO] Preparing start region for level 0
Client> loading single player
Client> 2013-05-19 03:26:52 [SERVER] [INFO] Tails_D[/127.0.0.1:0] logged in with entity id 38688 at (-293.6052618176285, 68.0, 104.50615337010291)
Client> Setting up custom skins
Client> 2013-05-19 03:27:00 [SERVER] [WARNING] Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-05-19 03:27:00 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:27:00 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:27:00 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:27:00 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> setting leash holder to nk['entity.LeashKnot.name'/38906, l='MpServer', x=-290,50, y=69,50, z=59,50]
Client> setting leash holder to nk['entity.LeashKnot.name'/38904, l='MpServer', x=-290,50, y=71,50, z=59,50]
Client> setting leash holder to nk['entity.LeashKnot.name'/38905, l='MpServer', x=-290,50, y=70,50, z=59,50]
Client> 2013-05-19 03:27:04 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:27:04 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:27:04 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:27:04 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:27:05 [SERVER] [INFO] Stopping server
Client> 2013-05-19 03:27:05 [SERVER] [INFO] Saving players
Client> 2013-05-19 03:27:05 [SERVER] [INFO] Saving worlds
Client> 2013-05-19 03:27:05 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:27:05 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:27:05 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:27:18 [SERVER] [INFO] Starting integrated minecraft server version 13w19a
Client> 2013-05-19 03:27:18 [SERVER] [INFO] Generating keypair
Client> 2013-05-19 03:27:19 [SERVER] [INFO] Preparing start region for level 0
Client> 2013-05-19 03:27:20 [SERVER] [INFO] Preparing spawn area: 88%
Client> loading single player
Client> 2013-05-19 03:27:20 [SERVER] [INFO] Tails_D[/127.0.0.1:0] logged in with entity id 39507 at (-292.41513630552714, 68.0, 104.46987512972024)
Client> Setting up custom skins
Client> 2013-05-19 03:27:21 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:27:21 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:27:22 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:27:22 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> setting leash holder to nk['entity.LeashKnot.name'/39725, l='MpServer', x=-290,50, y=70,50, z=59,50]
Client> setting leash holder to nk['entity.LeashKnot.name'/39724, l='MpServer', x=-290,50, y=71,50, z=59,50]
Client> setting leash holder to nk['entity.LeashKnot.name'/39726, l='MpServer', x=-290,50, y=69,50, z=59,50]
Client> 2013-05-19 03:27:28 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:27:28 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:27:28 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:27:28 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:27:29 [SERVER] [INFO] Stopping server
Client> 2013-05-19 03:27:29 [SERVER] [INFO] Saving players
Client> 2013-05-19 03:27:29 [SERVER] [INFO] Saving worlds
Client> 2013-05-19 03:27:29 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:27:29 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:27:29 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:27:33 [SERVER] [INFO] Starting integrated minecraft server version 13w19a
Client> 2013-05-19 03:27:33 [SERVER] [INFO] Generating keypair
Client> 2013-05-19 03:27:34 [SERVER] [INFO] Preparing start region for level 0
Client> loading single player
Client> 2013-05-19 03:27:35 [SERVER] [INFO] Tails_D[/127.0.0.1:0] logged in with entity id 40796 at (-291.13651908992193, 68.0, 105.08084065515851)
Client> Setting up custom skins
Client> 2013-05-19 03:27:37 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:27:37 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:27:37 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:27:37 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> setting leash holder to nk['entity.LeashKnot.name'/41011, l='MpServer', x=-290,50, y=69,50, z=59,50]
Client> setting leash holder to nk['entity.LeashKnot.name'/41009, l='MpServer', x=-290,50, y=71,50, z=59,50]
Client> setting leash holder to nk['entity.LeashKnot.name'/41010, l='MpServer', x=-290,50, y=70,50, z=59,50]
Client> 2013-05-19 03:27:40 [SERVER] [INFO] Saving and pausing game...
Client> 2013-05-19 03:27:46 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:27:46 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:27:46 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:27:46 [SERVER] [WARNING] Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-05-19 03:28:05 [SERVER] [INFO] Stopping server
Client> 2013-05-19 03:28:05 [SERVER] [INFO] Saving players
Client> 2013-05-19 03:28:05 [SERVER] [INFO] Saving worlds
Client> 2013-05-19 03:28:05 [SERVER] [INFO] Saving chunks for level 'Test World'/Overworld
Client> 2013-05-19 03:28:06 [SERVER] [INFO] Saving chunks for level 'Test World'/Nether
Client> 2013-05-19 03:28:06 [SERVER] [INFO] Saving chunks for level 'Test World'/The End
Client> 2013-05-19 03:28:10 [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)
Deleting C:\Documents and Settings\User\Application Data\.minecraft\versions\13w19a\13w19a-natives-51689185978385

Having the same issue and have been since 38a. I'll roll back 1-5 minutes from my last save.

I am also having the same issue. It was fine in 1.6.2, but the snapshots won't save the world.

I'm having this problem, too. Lava buckets I had placed into hoppers and furnaces just before saving and quitting are gone. I started seeing this with 1.8

[09:43:57] [Client thread/INFO]: Setting user: SwordsmanRyan
[09:43:57] [Client thread/INFO]: (Session ID is token:d260033a354649ceb5e610b423b83722:7ab8ad56fff04e6ca92a655d83d7e87f)
[09:44:05] [Client thread/INFO]: LWJGL Version: 2.9.1
[09:44:09] [Client thread/INFO]: Reloading ResourceManager: Default
[09:44:10] [Sound Library Loader/INFO]: Starting up SoundSystem...
[09:44:10] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use
[09:44:10] [Thread-6/INFO]: Initializing LWJGL OpenAL
[09:44:10] [Thread-6/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[09:44:11] [Thread-6/INFO]: OpenAL initialized.
[09:44:11] [Sound Library Loader/INFO]: Sound engine started
[09:44:20] [Client thread/INFO]: Created: 512x512 textures-atlas
[09:45:28] [Server thread/INFO]: Starting integrated minecraft server version 1.8
[09:45:28] [Server thread/INFO]: Generating keypair
[09:45:30] [Server thread/INFO]: Preparing start region for level 0
[09:45:31] [Server thread/INFO]: Preparing spawn area: 1%
[09:45:32] [Server thread/INFO]: Preparing spawn area: 13%
[09:45:33] [Server thread/INFO]: Preparing spawn area: 27%
[09:45:34] [Server thread/INFO]: Preparing spawn area: 42%
[09:45:35] [Server thread/INFO]: Preparing spawn area: 54%
[09:45:36] [Server thread/INFO]: Preparing spawn area: 69%
[09:45:37] [Server thread/INFO]: Preparing spawn area: 82%
[09:45:38] [Server thread/INFO]: Preparing spawn area: 95%
[09:45:38] [Server thread/INFO]: Changing view distance to 12, from 10
[09:45:40] [Server thread/INFO]: SwordsmanRyan[local:E:6b0ce0b7] logged in with entity id 217 at (-183.3540934274215, 74.0, 201.1436446118105)
[09:45:40] [Server thread/INFO]: SwordsmanRyan joined the game
[09:45:48] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 7979ms behind, skipping 159 tick(s)
[09:46:12] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 16224ms behind, skipping 324 tick(s)
[09:46:17] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4807ms behind, skipping 96 tick(s)
[09:46:43] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 15359ms behind, skipping 307 tick(s)
[09:46:48] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4780ms behind, skipping 95 tick(s)
[09:47:22] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 20094ms behind, skipping 401 tick(s)
[09:47:28] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 6008ms behind, skipping 120 tick(s)
[09:47:51] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 8765ms behind, skipping 175 tick(s)
[09:48:07] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 8291ms behind, skipping 165 tick(s)
[09:48:28] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 9715ms behind, skipping 194 tick(s)
[09:48:48] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 9926ms behind, skipping 198 tick(s)
[09:49:02] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 6604ms behind, skipping 132 tick(s)
[09:49:04] [Chunk Batcher 1/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.