Jack Ryan

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.

Same.