[MC-71357] Game Freezes when trying to save world

Hi Again,
I just updated to 1.8 and made a world on CUSTOMIZED setting. It functions perfectly during game play, but crashes while attempting to save the world. I'm not sure if this will help -
[22:09:14] [Client thread/INFO]: Setting user: GroundHound101
[22:09:16] [Client thread/INFO]: LWJGL Version: 2.9.1
[22:09:16] [Client thread/INFO]: Reloading ResourceManager: Default, Sanity.zip
[22:09:17] [Sound Library Loader/INFO]: Starting up SoundSystem...
[22:09:17] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use
[22:09:17] [Thread-6/INFO]: Initializing LWJGL OpenAL
[22:09:17] [Thread-6/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[22:09:17] [Thread-6/INFO]: OpenAL initialized.
[22:09:18] [Sound Library Loader/INFO]: Sound engine started
[22:09:19] [Client thread/WARN]: Texture minecraft:textures/items/lead.png with size 15x15 limits mip level from 4 to 0
[22:09:19] [Client thread/INFO]: Created: 512x512 textures-atlas
[22:09:28] [Client thread/ERROR]: Can't ping Hivemc.eu: Disconnected
[22:09:29] [Client thread/ERROR]: Can't ping The-reef.EU: Disconnected
[22:09:29] [Client thread/ERROR]: Can't ping Woodycraft.net: Disconnected
[22:09:30] [Client thread/ERROR]: Can't ping play.cubecraftgames.net: Disconnected
[22:09:40] [Client thread/ERROR]: Can't ping Woodycraft.net: Disconnected
[22:09:40] [Client thread/ERROR]: Can't ping play.cubecraftgames.net: Disconnected
[22:09:41] [Client thread/ERROR]: Can't ping Hivemc.eu: Disconnected
[22:09:42] [Client thread/ERROR]: Can't ping The-reef.EU: Disconnected
[22:10:08] [Client thread/ERROR]: Can't ping The-reef.EU: Disconnected
[22:10:09] [Client thread/ERROR]: Can't ping Woodycraft.net: Disconnected
[22:10:09] [Client thread/ERROR]: Can't ping play.cubecraftgames.net: Disconnected
[22:10:09] [Client thread/ERROR]: Can't ping Hivemc.eu: Disconnected
[22:12:54] [Server thread/INFO]: Starting integrated minecraft server version 1.8
[22:12:54] [Server thread/INFO]: Generating keypair
[22:12:55] [Server thread/INFO]: Preparing start region for level 0
[22:12:56] [Server thread/INFO]: Preparing spawn area: 77%
[22:12:56] [Server thread/INFO]: GroundHound101[local:E:67cebc17] logged in with entity id 299 at (-310.8787485535104, 70.0, 266.4317168381474)
[22:12:56] [Server thread/INFO]: GroundHound101 joined the game
[22:12:56] [Server thread/INFO]: Changing view distance to 21, from 10
[22:12:58] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2433ms behind, skipping 48 tick(s)
[22:12:58] [Server thread/INFO]: Saving and pausing game...
[22:12:58] [Server thread/INFO]: Saving chunks for level 'First 1.8'/Overworld
[22:12:59] [Server thread/INFO]: Saving chunks for level 'First 1.8'/Nether
[22:12:59] [Server thread/INFO]: Saving chunks for level 'First 1.8'/The End
[22:13:01] [Client thread/INFO]: Started on 56041
[22:13:01] [Client thread/INFO]: [CHAT] Local game hosted on port 56041
[22:13:05] [Server thread/INFO]: GroundHound101 lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[22:13:05] [Server thread/INFO]: GroundHound101 left the game
[22:13:05] [Server thread/INFO]: Stopping singleplayer server as player logged out
[22:13:05] [Server thread/INFO]: Stopping server
[22:13:05] [Server thread/INFO]: Saving players
[22:13:05] [Server thread/INFO]: Saving worlds
[22:13:05] [Server thread/INFO]: Saving chunks for level 'First 1.8'/Overworld
[22:13:05] [Server thread/INFO]: Saving chunks for level 'First 1.8'/Nether
[22:13:05] [Server thread/INFO]: Saving chunks for level 'First 1.8'/The End