Leanid Raichonak

I can not know what are the causes occurring bug. The apparent similarity of the result may be different bugs. IMHO, better close bug (if duplicate) after view logs and screenshots, what all successively to write in existing. For example, I thought that would be useful information in the logs:

Chunk file at 67,19 is in the wrong location; relocating. (Expected 67, 19, got 80, 19)
Chunk file at 67,20 is in the wrong location; relocating. (Expected 67, 20, got 80, 19)
Chunk file at 68,7 is in the wrong location; relocating. (Expected 68, 7, got 87, 11)
Chunk file at 69,16 is in the wrong location; relocating. (Expected 69, 16, got 77, 7)
Wrong location! qn['Skeleton'/52341, l='myworld', x=1074.50, y=32.00, z=327.50]
java.lang.Exception: Stack trace
	at java.lang.Thread.dumpStack(Thread.java:1273)
	at zz.a(SourceFile:504)
	at yc.d(SourceFile:832)
	at yp.a(SourceFile:138)
	at in.b(SourceFile:113)
	at net.minecraft.server.MinecraftServer.r(SourceFile:736)
	at ho.r(SourceFile:248)
	at net.minecraft.server.MinecraftServer.q(SourceFile:679)
	at net.minecraft.server.MinecraftServer.run(SourceFile:613)
	at fy.run(SourceFile:849)

Thanks.

Note: it's not clean launch. I'm try load world in which played about a year. Few days ago minecraft_server crashed and after that I can not run saved world.

4GB

After running with extended allowed memory size i'm become next bug: MC-3742.
JVM has updated to 1.6.0_37.

Mods isn't installed.

1) No, mods isn't installed.
3) I'm run server from GUI.