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I was playing on my world today and had put in a lot of work for a project. I noticed it was getting a bit laggy so I saved and quit, then turned off my computer. Then when I got back on after the restart my world wouldn't show up. I've tried copying and pasting my world into a new one with the same result, the world just disappears. When I can get the copy and paste to work it spawns me below bedrock in the void, or in the ocean. I fixed this once but I'm not sure how. Please help, I've put so much into this world and I'm not starting over.

What do you mean?

Update: Anytime I try to launch a new world I get an error code as soon as the world loads in and my game crashes.

Completely ignored arguments: [--nativeLauncherVersion, 301]
[22:52:16] [Client thread/INFO]: Setting user: iStiky
[22:52:17] [Client thread/INFO]: LWJGL Version: 2.9.4
[22:52:17] [Client thread/INFO]: Reloading ResourceManager: Default
[22:52:28] [Sound Library Loader/INFO]: Starting up SoundSystem...
[22:52:28] [Thread-5/INFO]: Initializing LWJGL OpenAL
[22:52:28] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[22:52:28] [Thread-5/INFO]: OpenAL initialized.
[22:52:28] [Sound Library Loader/INFO]: Sound engine started
[22:52:29] [Client thread/INFO]: Created: 1024x512 textures-atlas
[22:52:33] [Server thread/INFO]: Starting integrated minecraft server version 1.9.4
[22:52:33] [Server thread/INFO]: Generating keypair
[22:52:33] [Server thread/INFO]: Preparing start region for level 0
[22:52:34] [Server thread/INFO]: Preparing spawn area: 46%
[22:52:35] [Server thread/INFO]: Changing view distance to 7, from 10
[22:52:35] [Server thread/INFO]: iStiky[local:E:1faabfac] logged in with entity id 1203 at (-121.5, 68.0, 62.5)
[22:52:35] [Server thread/INFO]: iStiky joined the game
[22:52:36] [Server thread/INFO]: Saving and pausing game...
[22:52:36] [Server thread/INFO]: Saving chunks for level 'New World'/Overworld
[22:52:36] [Server thread/INFO]: Saving chunks for level 'New World'/Nether
[22:52:36] [Server thread/INFO]: Saving chunks for level 'New World'/The End
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffbe87b2177, pid=10604, tid=14004
#
# JRE version: Java(TM) SE Runtime Environment (8.0_25-b18) (build 1.8.0_25-b18)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C [ig75icd64.dll+0x12177]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Users\Mason\AppData\Roaming\.minecraft\hs_err_pid10604.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Okay I got that to work, but it spawns me in the middle of the ocean with no items. Why is that??