When clicking on one game and select to open it goes right back to the title screen.
When clicking on the game we were playing today it drops the character in the world and then crashes.
Wont open any of the games, nothing was done on my end of the computer, I did no updates or downloads.
Thank You for your time.
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---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!
Time: 7/9/13 4:30 PM
Description: Sending packet
java.lang.NullPointerException
at cm.b(SourceFile:116)
at cm.a(SourceFile:41)
at jz.b(SourceFile:421)
at hm.b(SourceFile:648)
at hm.a(SourceFile:82)
at bkz.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.t(SourceFile:488)
at net.minecraft.server.MinecraftServer.s(SourceFile:405)
at bkw.s(SourceFile:124)
at net.minecraft.server.MinecraftServer.run(SourceFile:339)
at hh.run(SourceFile:582)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at cm.b(SourceFile:116)
at cm.a(SourceFile:41)
-- Packet being sent --
Details:
Packet ID: 4
Packet class: fw
Stacktrace:
at jz.b(SourceFile:421)
at hm.b(SourceFile:648)
at hm.a(SourceFile:82)
at bkz.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.t(SourceFile:488)
at net.minecraft.server.MinecraftServer.s(SourceFile:405)
at bkw.s(SourceFile:124)
at net.minecraft.server.MinecraftServer.run(SourceFile:339)
at hh.run(SourceFile:582)
-- System Details --
Details:
Minecraft Version: 1.6.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_04-ea, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 108980176 bytes (103 MB) / 460214272 bytes (438 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 7785 (435960 bytes; 0 MB) allocated, 7785 (435960 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 30296 (1696576 bytes; 1 MB) allocated, 30296 (1696576 bytes; 1 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

Duplicate of MC-23939.
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