new snapshot problems

i am having a lot of troubles with the new snapshot. i don't know how to fix it, so i have included the most recent crash report which will sum up my problems. thank you in advanced. - josh

Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Updating screen events

A full error report has been saved to C:\Users\Josh\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-03_19.38.33-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash :(



--- BEGIN ERROR REPORT bae4d5ba --------
Full report at:
C:\Users\Josh\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-03_19.38.33-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 03/01/13 7:38 PM

-- Head --
Stacktrace:
	at bfm.a(SourceFile:183)
	at auy.a(SourceFile:72)
	at bfm.a(SourceFile:414)
	at auy.d(SourceFile:127)
	at auy.m(SourceFile:111)

-- Affected screen --
Details:
	Screen name: bfm
Stacktrace:
	at net.minecraft.client.Minecraft.l(SourceFile:1086)
	at net.minecraft.client.Minecraft.J(SourceFile:582)
	at net.minecraft.client.Minecraft.run(SourceFile:534)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 13w01a
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_10, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 471999296 bytes (450 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 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: AMD Radeon HD 7640G GL version 4.2.11764 Compatibility Profile Context, ATI Technologies Inc.
	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

java.lang.NoClassDefFoundError: aux
	at bfm.a(SourceFile:183)
	at auy.a(SourceFile:72)
	at bfm.a(SourceFile:414)
	at auy.d(SourceFile:127)
	at auy.m(SourceFile:111)
	at net.minecraft.client.Minecraft.l(SourceFile:1086)
	at net.minecraft.client.Minecraft.J(SourceFile:582)
	at net.minecraft.client.Minecraft.run(SourceFile:534)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: aux
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 9 more
--- END ERROR REPORT 825bcffe ----------