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I've been having problems launching 1.5.2, as of today, no matter what I use to launch it. I tried the new launcher and magic launcher, but they both give me this exact same crash message. If anyone knows what's causing this, I'd be much appreciated. I tried a fresh .jar file as well with no luck their either :/

---- Minecraft Crash Report ----
// There are four lights!

Time: 7/16/13 11:11 PM
Description: Failed to start game

java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:61)
at java.io.InputStreamReader.<init>(InputStreamReader.java:80)
at bp.a(SourceFile:64)
at bp.a(SourceFile:100)
at net.minecraft.client.Minecraft.a(SourceFile:252)
at avv.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:507)
at java.lang.Thread.run(Thread.java:680)


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

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_35, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 51843536 bytes (49 MB) / 85000192 bytes (81 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 1 total; -Xmx1G
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: 2.9.0
OpenGL: ATI Radeon HD 6490M OpenGL Engine GL version 2.1 ATI-1.6.36, ATI Technologies Inc.
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null