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I deleted everything and installed a fresh copy of 64 bit java.
I deleted minecraft and reinstalled.
I copied the .jar from mojang.com for the latest snapshot.

When I start minecraft, after the login screen, I see the orange Mojang logo for 4-5 seconds and then the error screen with the below crash log.

Any ideas?

---- Minecraft Crash Report ----
// I just don't know what went wrong

Time: 1/10/13 10:19 PM
Description: Failed to start game

java.lang.NullPointerException
at javax.imageio.ImageIO.write(Unknown Source)
at bem.c(SourceFile:312)
at beo.b(SourceFile:134)
at bcd.c(SourceFile:429)
at net.minecraft.client.Minecraft.a(SourceFile:296)
at atr.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:506)
at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
Minecraft Version: 13w02a
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_10, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 449500280 bytes (428 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: GeForce GTX 680/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

replace the whole .minecraft folder, happened to me, this worked

Quote from mremodrulez

replace the whole .minecraft folder, happened to me, this worked

But what about my saved worlds?

Nevermind. I copied the "saves" and "screenshots" folder to another place. Then I did as you said and deleted the entire .minecraft folder altogether. I installed minecraft, copied the snapshot jar over, and then I pasted my saves/screenshots folder back into .minecraft.

Started minecraft up and its working like a charm!

Thanks mremodrulez!

Quote from nootron

But what about my saved worlds?

Nevermind. I copied the "saves" and "screenshots" folder to another place. Then I did as you said and deleted the entire .minecraft folder altogether. I installed minecraft, copied the snapshot jar over, and then I pasted my saves/screenshots folder back into .minecraft.

Started minecraft up and its working like a charm!

Thanks mremodrulez!

Great, this "bug" happens while your downloading or updating minecraft.