I've been playing with no problems on 1.7.10 since it came out, but when I made a new profile with the snapshot enabled, it won't start up. I have played with the snapshot before with no problems, but now it won't work for some reason. This issue happens on all snapshots for me.
Starting up SoundSystem...
Initializing LWJGL OpenAL
(The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
OpenAL initialized.
[11:21:06] [Sound Library Loader/INFO]: Sound engine started
[11:21:31] [Client thread/INFO]: Created: 512x512 textures-atlas
[11:21:35] [Client thread/WARN]: Failed to load shader: minecraft:shaders/post/entity_outline.json
oq: Invalid shaders/program/sobel.vsh: Couldn't compile vertex program: ERROR: 0:1: '' : Version number not supported by GL2
ERROR: 1 compilation errors. No code generated.
at crp.a(SourceFile:67) ~[14w30c.jar:?]
at crm.<init>(SourceFile:132) ~[14w30c.jar:?]
at cro.<init>(SourceFile:26) ~[14w30c.jar:?]
at crn.a(SourceFile:268) ~[14w30c.jar:?]
at crn.a(SourceFile:138) ~[14w30c.jar:?]
at crn.a(SourceFile:86) ~[14w30c.jar:?]
at crn.<init>(SourceFile:52) ~[14w30c.jar:?]
at ciy.c(SourceFile:225) [14w30c.jar:?]
at brp.ai(SourceFile:481) [14w30c.jar:?]
at brp.a(SourceFile:296) [14w30c.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:120) [14w30c.jar:?]
I also can't force a crash, because it never makes it past the Mojan screen and freezes almost immediately
Log:
[11:20:47] [Client thread/INFO]: (Session ID is token:406e0c3e3c4945068c50537a1c864b26:4fca4ed85655433fb4ac0c7b82e0a29d)
[11:20:55] [Client thread/INFO]: LWJGL Version: 2.9.1
[11:20:57] [Client thread/INFO]: Reloading ResourceManager: Default
Starting up SoundSystem...
Initializing LWJGL OpenAL
(The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
OpenAL initialized.
[11:21:06] [Sound Library Loader/INFO]: Sound engine started
[11:21:31] [Client thread/INFO]: Created: 512x512 textures-atlas
[11:21:35] [Client thread/WARN]: Failed to load shader: minecraft:shaders/post/entity_outline.json
oq: Invalid shaders/program/sobel.vsh: Couldn't compile vertex program: ERROR: 0:1: '' : Version number not supported by GL2
ERROR: 1 compilation errors. No code generated.
at crp.a(SourceFile:67) ~[14w30c.jar:?]
at crm.<init>(SourceFile:132) ~[14w30c.jar:?]
at cro.<init>(SourceFile:26) ~[14w30c.jar:?]
at crn.a(SourceFile:268) ~[14w30c.jar:?]
at crn.a(SourceFile:138) ~[14w30c.jar:?]
at crn.a(SourceFile:86) ~[14w30c.jar:?]
at crn.<init>(SourceFile:52) ~[14w30c.jar:?]
at ciy.c(SourceFile:225) [14w30c.jar:?]
at brp.ai(SourceFile:481) [14w30c.jar:?]
at brp.a(SourceFile:296) [14w30c.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:120) [14w30c.jar:?]
I also can't force a crash, because it never makes it past the Mojan screen and freezes almost immediately
same problem with 1.8, same log