---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 8/10/14 5:56 PM
Description: Exception while ticking a block

java.lang.ClassCastException: ayv cannot be cast to azh
at amj.b(SourceFile:42)
at eg.a(SourceFile:12)
at auw.d(SourceFile:105)
at auw.c(SourceFile:131)
at qr.a(SourceFile:527)
at qr.c(SourceFile:199)
at net.minecraft.server.MinecraftServer.y(SourceFile:598)
at net.minecraft.server.MinecraftServer.x(SourceFile:530)
at cxz.x(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:446)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at amj.b(SourceFile:42)
at eg.a(SourceFile:12)
at auw.d(SourceFile:105)
at auw.c(SourceFile:131)

– Block being ticked –
Details:
Block: minecraft:dispenser[facing=south,triggered=true]
Block location: World: (-4,62,-1), Chunk: (at 12,3,15 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Stacktrace:
at qr.a(SourceFile:527)
at qr.c(SourceFile:199)

– Affected level –
Details:
Level name: Rail
All players: 1 total; [qu['mgc11'/0, l='Rail', x=-5.93, y=61.86, z=0.18]]
Chunk stats: ServerChunkCache: 1937 Drop: 0
Level seed: -4719947422472379206
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
Level spawn location: 855.00,4.00,-94.00 - World: (855,4,-94), Chunk: (at 7,0,2 in 53,-6; contains blocks 848,0,-96 to 863,255,-81), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
Level time: 51127 game time, 1415 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 53177 (now: false), thunder time: 48589 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.y(SourceFile:598)
at net.minecraft.server.MinecraftServer.x(SourceFile:530)
at cxz.x(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:446)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 14w32d
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2873822336 bytes (2740 MB) / 4128768000 bytes (3937 MB) up to 4128768000 bytes (3937 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -Xms4G
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [qu['mgc11'/0, l='Rail', x=-5.93, y=61.86, z=0.18]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.