Crashes after loading an 14w27b saved world.
Some chunks are loaded and during that it crashes. No keys pressed.
Vanilla, no mods, singleplayer.

---- Minecraft Crash Report ----
// I feel sad now

Time: 09/07/14 18:29
Description: Exception ticking world

java.lang.IllegalArgumentException: Cannot get property bcl

as it does not exist!
at bbw.b(SourceFile:91)
at ayt.b(SourceFile:127)
at ayt.c(SourceFile:69)
at ary.b(SourceFile:416)
at qg.h(SourceFile:373)
at qg.c(SourceFile:199)
at net.minecraft.server.MinecraftServer.x(SourceFile:578)
at net.minecraft.server.MinecraftServer.w(SourceFile:510)
at cwg.w(SourceFile:132)
at net.minecraft.server.MinecraftServer.run(SourceFile:426)
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 bbw.b(SourceFile:91)
at ayt.b(SourceFile:127)
at ayt.c(SourceFile:69)
at ary.b(SourceFile:416)
at qg.h(SourceFile:373)
at qg.c(SourceFile:199)

– Affected level –
Details:
Level name: Castle Master
All players: 1 total; [qj['Jumperado'/381, l='Castle Master', x=-4,02, y=71,00, z=-36,11]]
Chunk stats: ServerChunkCache: 1522 Drop: 0
Level seed: -6922134961362156791
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: 84,00,64,00,252,00 - World: (84,64,252), Chunk: (at 4,4,12 in 5,15; contains blocks 80,0,240 to 95,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 7603745 game time, 3401 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 92061 (now: false), thunder time: 87080 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.x(SourceFile:578)
at net.minecraft.server.MinecraftServer.w(SourceFile:510)
at cwg.w(SourceFile:132)
at net.minecraft.server.MinecraftServer.run(SourceFile:426)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 14w28a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 145283984 bytes (138 MB) / 568328192 bytes (542 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [qj['Jumperado'/381, l='Castle Master', x=-4,02, y=71,00, z=-36,11]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.