Scoreboard objective disappears!

1. Create a scoreboard objective.
2. Close the world and restart that world.
3. Tada! Objective has disappeared!

.... I can't understand this situation, but this really annoys me.

Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Manually triggered debug crash

A full error report has been saved to C:\Documents and Settings\MYHOME\Application Data\.minecraft\crash-reports\crash-2013-03-17_17.43.38-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash :(



--- BEGIN ERROR REPORT 8cbae7ca --------
Full report at:
C:\Documents and Settings\MYHOME\Application Data\.minecraft\crash-reports\crash-2013-03-17_17.43.38-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 13. 3. 17 오후 5:43

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [EntityClientPlayerMP['secondwill'/0, l='MpServer', x=-613.49, y=57.62, z=793.88]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-609,4,771), Chunk: (at 15,0,3 in -39,48; contains blocks -624,0,768 to -609,255,783), Region: (-2,1; contains chunks -64,32 to -33,63, blocks -1024,0,512 to -513,255,1023)
	Level time: 19598 game time, 3764 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: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 1 total; [EntityClientPlayerMP['secondwill'/0, l='MpServer', x=-613.49, y=57.62, z=793.88]]
	Retry entities: 0 total; []
Stacktrace:
	at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:441)
	at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2404)
	at net.minecraft.client.Minecraft.run(Minecraft.java:771)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 1.5
	Operating System: Windows XP (x86) version 5.1
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 170169584 bytes (162 MB) / 419680256 bytes (400 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 2 total; -Xincgc -Xmx1024m
	AABB Pool Size: 65 (3640 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: FML and Forge are installed
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP v7.42 FML v5.0.24.582 Minecraft Forge 7.7.0.582 4 mods loaded, 4 mods active
	mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	NBTEdit [In-game NBTEdit] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	LWJGL: 2.8.3
	OpenGL: GeForce Go 7400/PCI/SSE2 GL version 2.0.1, NVIDIA Corporation
	Is Modded: Definitely; Client brand changed to 'forge,fml'
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 47 (2632 bytes; 0 MB) allocated, 17 (952 bytes; 0 MB) used

java.lang.Throwable
	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1607)
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:830)
	at net.minecraft.client.Minecraft.run(Minecraft.java:755)
	at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT ad253a8b ----------