Visited chunks regenerate in my world, buildings are replaced somewhere to original look.

Here is randomly some dirt and coal placed. I think, it is regenerated from the chunk. Also there generated a leck in the wand on the left.

In this picture, there is a complete box of blocks placed in a room.

Can you please press F3 and C while in-game for 10 seconds to force a crash and attach the resulting crash log here ?

OK, here is the crash log:

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:\Users\Leo\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-24_19.11.20-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 e5e6dcdf --------
Full report at:
C:\Users\Leo\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-24_19.11.20-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 24.11.12 19:11

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [ayk['Leo'/410, l='MpServer', x=-80,65, y=67,62, z=220,18]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-96,64,256), Chunk: (at 0,4,0 in -6,16; contains blocks -96,0,256 to -81,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 2659752 game time, 2957503 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: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 53 total; [pe['Schaf'/387, l='MpServer', x=-13,78, y=62,00, z=189,22], pe['Schaf'/388, l='MpServer', x=-4,50, y=66,00, z=180,50], px['item.tile.sapling.oak'/305, l='MpServer', x=-104,28, y=79,13, z=227,13], ow['Fledermaus'/304, l='MpServer', x=-100,31, y=12,24, z=170,13], px['item.tile.sapling.oak'/307, l='MpServer', x=-104,88, y=81,13, z=230,88], px['item.tile.sapling.oak'/306, l='MpServer', x=-103,84, y=79,13, z=227,66], px['item.tile.sapling.oak'/309, l='MpServer', x=-105,47, y=80,13, z=229,13], px['item.tile.sapling.oak'/308, l='MpServer', x=-104,88, y=82,13, z=226,28], oy['Huhn'/310, l='MpServer', x=-107,47, y=75,00, z=294,34], ow['Fledermaus'/315, l='MpServer', x=-93,25, y=14,10, z=176,75], pe['Schaf'/317, l='MpServer', x=-86,78, y=71,00, z=281,50], ow['Fledermaus'/316, l='MpServer', x=-93,47, y=12,10, z=176,69], ow['Fledermaus'/288, l='MpServer', x=-150,94, y=49,24, z=143,13], px['item.tile.dirt'/328, l='MpServer', x=-76,13, y=68,13, z=209,88], ow['Fledermaus'/289, l='MpServer', x=-159,75, y=45,57, z=162,88], px['item.tile.dirt'/331, l='MpServer', x=-78,78, y=67,13, z=209,41], px['item.tile.sapling.oak'/305, l='MpServer', x=-104,28, y=79,13, z=227,13], pe['Schaf'/291, l='MpServer', x=-135,66, y=73,00, z=290,97], px['item.tile.dirt'/329, l='MpServer', x=-77,88, y=66,13, z=208,28], oy['Huhn'/292, l='MpServer', x=-152,29, y=67,00, z=287,68], px['item.tile.sapling.oak'/306, l='MpServer', x=-103,84, y=79,13, z=227,66], px['item.tile.sapling.oak'/307, l='MpServer', x=-104,88, y=81,13, z=230,88], px['item.tile.sapling.oak'/308, l='MpServer', x=-104,88, y=82,13, z=226,28], px['item.tile.sapling.oak'/309, l='MpServer', x=-105,47, y=80,13, z=229,13], px['item.tile.dirt'/326, l='MpServer', x=-76,56, y=66,13, z=208,13], pe['Schaf'/298, l='MpServer', x=-117,47, y=78,00, z=280,06], ayk['Leo'/410, l='MpServer', x=-80,65, y=67,62, z=220,18], px['item.tile.dirt'/332, l='MpServer', x=-77,69, y=67,13, z=209,56], px['item.tile.dirt'/327, l='MpServer', x=-75,88, y=67,13, z=208,88], px['item.tile.dirt'/330, l='MpServer', x=-78,13, y=67,13, z=210,88], px['item.tile.dirt'/333, l='MpServer', x=-77,44, y=67,13, z=210,88], pe['Schaf'/339, l='MpServer', x=-66,41, y=71,00, z=263,59], pe['Schaf'/338, l='MpServer', x=-66,28, y=71,00, z=266,88], pe['Schaf'/337, l='MpServer', x=-64,50, y=71,00, z=258,09], pe['Schaf'/336, l='MpServer', x=-64,19, y=71,00, z=266,69], pe['Schaf'/347, l='MpServer', x=-61,34, y=68,00, z=182,13], px['item.tile.dirt'/326, l='MpServer', x=-76,56, y=66,13, z=208,13], px['item.tile.dirt'/327, l='MpServer', x=-75,88, y=67,13, z=208,88], pe['Schaf'/334, l='MpServer', x=-67,42, y=71,00, z=266,83], pe['Schaf'/335, l='MpServer', x=-68,50, y=71,00, z=265,56], px['item.tile.dirt'/332, l='MpServer', x=-77,69, y=67,13, z=209,56], px['item.tile.dirt'/333, l='MpServer', x=-77,44, y=67,13, z=210,88], px['item.tile.dirt'/330, l='MpServer', x=-78,13, y=67,13, z=210,88], px['item.tile.dirt'/331, l='MpServer', x=-78,78, y=67,13, z=209,41], px['item.tile.dirt'/328, l='MpServer', x=-76,13, y=68,13, z=209,88], px['item.tile.dirt'/329, l='MpServer', x=-77,88, y=66,13, z=208,28], pe['Schaf'/368, l='MpServer', x=-26,88, y=92,00, z=299,44], pe['Schaf'/381, l='MpServer', x=-3,75, y=83,00, z=144,06], ow['Fledermaus'/382, l='MpServer', x=-10,56, y=22,10, z=172,59], pe['Schaf'/364, l='MpServer', x=-19,50, y=69,00, z=212,50], pe['Schaf'/365, l='MpServer', x=-24,66, y=71,00, z=224,56], pe['Schaf'/366, l='MpServer', x=-30,50, y=68,00, z=300,50], ph['Tintenfisch'/363, l='MpServer', x=-18,19, y=57,34, z=173,25]]
	Retry entities: 0 total; []
Stacktrace:
	at ayh.a(SourceFile:290)
	at net.minecraft.client.Minecraft.b(SourceFile:1870)
	at net.minecraft.client.Minecraft.run(SourceFile:543)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 1.4.5
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.6.0_31, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
	Memory: 271410920 bytes (258 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 16435 (920360 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	LWJGL: 2.4.2
	OpenGL: Intel(R) HD Graphics 3000 GL version 3.1.0 - Build 8.15.10.2696, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 722 (40432 bytes; 0 MB) allocated, 11 (616 bytes; 0 MB) used

java.lang.Throwable
	at net.minecraft.client.Minecraft.l(SourceFile:1171)
	at net.minecraft.client.Minecraft.J(SourceFile:582)
	at net.minecraft.client.Minecraft.run(SourceFile:534)
	at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT c6d0fbec ----------

Nothing special in your crash report, but you Java is way outdated, you should urgently update this, also because of security issues in the older versions. Visit http://java.com . Please report, if the updated Java changes something at your issue (I suppose not, but it's worth a try)

Shortened the title

Duplicate of MC-2548