i can't load worlds or servers

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 7/27/14 1:41 PM
Description: Ticking screen

java.lang.IndexOutOfBoundsException
	at java.nio.Buffer.checkIndex(Buffer.java:512)
	at java.nio.DirectIntBufferU.get(DirectIntBufferU.java:248)
	at bls.a(SourceFile:270)
	at bls.a(SourceFile:220)
	at azd.a(SourceFile:1675)
	at azd.a(SourceFile:1633)
	at biv.a(SourceFile:113)
	at gu.a(SourceFile:70)
	at gu.a(SourceFile:13)
	at ef.a(SourceFile:164)
	at bbe.c(SourceFile:76)
	at azd.o(SourceFile:1318)
	at azd.ad(SourceFile:753)
	at azd.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at java.nio.Buffer.checkIndex(Buffer.java:512)
	at java.nio.DirectIntBufferU.get(DirectIntBufferU.java:248)
	at bls.a(SourceFile:270)
	at bls.a(SourceFile:220)
	at azd.a(SourceFile:1675)
	at azd.a(SourceFile:1633)
	at biv.a(SourceFile:113)
	at gu.a(SourceFile:70)
	at gu.a(SourceFile:13)
	at ef.a(SourceFile:164)
	at bbe.c(SourceFile:76)

-- Affected screen --
Details:
	Screen name: bbe

-- Affected level --
Details:
	Level name: MpServer
	All players: 0 total; []
	Chunk stats: MultiplayerChunkCache: 0, 0
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 0 game time, 0 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 0 total; []
	Retry entities: 0 total; []
	Server brand: ~~ERROR~~ NullPointerException: null
	Server type: Non-integrated multiplayer server
Stacktrace:
	at biz.a(SourceFile:284)
	at azd.b(SourceFile:1951)
	at azd.e(SourceFile:713)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Mac OS X (x86_64) version 10.8.5
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 122239552 bytes (116 MB) / 177287168 bytes (169 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	AABB Pool Size: 18497 (1035832 bytes; 0 MB) allocated, 18497 (1035832 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.2
	LWJGL: 2.9.1
	OpenGL: NVIDIA GeForce 320M OpenGL Engine GL version 2.1 NVIDIA-8.16.76 310.40.00.20f04, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)