After logging in and signing into minecraft, then I choose multiplayer...it crashes. the crash report has been placed inside of the description box.

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What I expected to happen was...:
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What actually happened was...:
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Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
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Minecraft Crash Report ----
// Why is it breaking 😞

Time: 2/20/14 4:00 PM
Description: Rendering screen

java.lang.IllegalArgumentException: bad Base64 input character at 2810: 64 (decimal)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:247)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:197)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:188)
at bge.b(SourceFile:155)
at bge.a(SourceFile:130)
at bat.a(SourceFile:26)
at bay.b(SourceFile:382)
at bay.a(SourceFile:259)
at bgb.a(SourceFile:283)
at bll.b(SourceFile:851)
at azd.ad(SourceFile:780)
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 io.netty.handler.codec.base64.Base64.decode(Base64.java:247)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:197)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:188)
at bge.b(SourceFile:155)
at bge.a(SourceFile:130)
at bat.a(SourceFile:26)
at bay.b(SourceFile:382)
at bay.a(SourceFile:259)
at bgb.a(SourceFile:283)

– Screen render details –
Details:
Screen name: bgb
Mouse location: Scaled: (239, 143). Absolute: (478, 193)
Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2
Stacktrace:
at bll.b(SourceFile:851)
at azd.ad(SourceFile:780)
at azd.e(SourceFile:704)
at net.minecraft.client.main.Main.main(SourceFile:103)

– System Details –
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 22451016 bytes (21 MB) / 77987840 bytes (74 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.2
LWJGL: 2.9.0
OpenGL: ATI Radeon 3100 Graphics GL version 2.1.8787, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [_Vibrant.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~_ERROR~ NullPointerException: null
Anisotropic Filtering: On (16)