When trying to load a world in the snapshot it immediately crashes with this in the launcher log: Completely ignored arguments: [--nativeLauncherVersion, 286]
[13:01:45] [Client thread/INFO]: Setting user: MrBananaBob
[13:01:45] [Client thread/INFO]: (Session ID is token:93d8e1f473444327a31f24a91218834d:1ec6cf80d8224966b909bbd719453b3a)
[13:01:47] [Client thread/INFO]: LWJGL Version: 2.9.4
[13:01:47] [Client thread/INFO]: Reloading ResourceManager: Default
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:block.brewing_stand.brew
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:block.chorus_flower.death
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:block.chorus_flower.grow
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:enchant.thorns.hit
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.guardian.thorns
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.horse.eat
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.crit
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.knockback
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.parry
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.strong
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.sweep
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.weak
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.rabbit.attack
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.shield.block
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.ambient
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.close
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.death
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.open
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker_bullet.hit
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker_bullet.hurt
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.ambient
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.death
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.drink
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.hurt
[13:01:55] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.throw
[13:01:55] [Sound Library Loader/INFO]: Starting up SoundSystem...
[13:01:55] [Thread-5/INFO]: Initializing LWJGL OpenAL
[13:01:55] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[13:01:55] [Thread-5/INFO]: OpenAL initialized.
[13:01:55] [Sound Library Loader/INFO]: Sound engine started
[13:01:57] [Client thread/INFO]: Created: 1024x512 textures-atlas
[13:01:58] [Client thread/ERROR]: Realms module missing
[13:02:07] [Client thread/INFO]: Deleting level BLAH BAH
[13:02:07] [Client thread/INFO]: Attempt 1...
[13:02:30] [Client thread/ERROR]: Realms module missing
[13:02:30] [Server thread/INFO]: Starting integrated minecraft server version 15w45a
[13:02:30] [Server thread/INFO]: Generating keypair
[13:02:31] [Server thread/INFO]: Preparing start region for level 0
[13:02:32] [Server thread/INFO]: Preparing spawn area: 7%
[13:02:33] [Server thread/INFO]: Preparing spawn area: 13%
[13:02:34] [Server thread/INFO]: Preparing spawn area: 22%
[13:02:35] [Server thread/INFO]: Preparing spawn area: 32%
[13:02:36] [Server thread/INFO]: Preparing spawn area: 40%
[13:02:37] [Server thread/INFO]: Preparing spawn area: 51%
[13:02:38] [Server thread/INFO]: Preparing spawn area: 63%
[13:02:39] [Server thread/INFO]: Preparing spawn area: 73%
[13:02:41] [Server thread/INFO]: Preparing spawn area: 83%
[13:02:42] [Server thread/INFO]: Preparing spawn area: 94%
[13:02:42] [Server thread/INFO]: Changing view distance to 24, from 10
[13:02:43] [Server thread/INFO]: MrBananaBob[local:E:1c363d30] logged in with entity id 196 at (139.5, 64.0, 259.5)
[13:02:43] [Server thread/INFO]: MrBananaBob joined the game
[13:02:47] [Server thread/INFO]: Saving and pausing game...
[13:02:47] [Server thread/INFO]: Saving chunks for level 'farts'/Overworld
[13:02:53] [Server thread/INFO]: Saving chunks for level 'farts'/Nether
[13:02:53] [Server thread/INFO]: Saving chunks for level 'farts'/The End
[13:02:53] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 9807ms behind, skipping 196 tick(s)
[13:02:56] [Server thread/INFO]: Changing view distance to 11, from 24
#

1. A fatal error has been detected by the Java Runtime Environment:
   #
2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffe5b2f125c, pid=6848, tid=36144
   #
3. JRE version: Java(TM) SE Runtime Environment (8.0_25-b18) (build 1.8.0_25-b18)
4. Java VM: Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode windows-amd64 compressed oops)
5. Problematic frame:
6. C [ig8icd64.dll+0x63125c]
   #
7. Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
   #
8. An error report file with more information is saved as:
9. C:\Users\Irie\AppData\Roaming\.minecraft\hs_err_pid6848.log
   #
10. If you would like to submit a bug report, please visit:
11. http://bugreport.sun.com/bugreport/crash.jsp
12. The crash happened outside the Java Virtual Machine in native code.
13. 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

Same thing happens in 1.8.8 , except I was able to open a world only to be teleported and then crash. I don't know if it's on my end or yours, but it happened in the last 2 previous snapshots aswell.