I place my melons and pumpkins down NEXT to eachother and a few work but when i place another, it disappears along with the one it was next to. I was in singleplayer, but it does happen in multiplayer. I have no mods installed.

If you need the crash report, here it is:

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\KTJ9139\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-27_16.55.27-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 4bdedf57 --------
Full report at:
C:\Users\KTJ9139\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-27_16.55.27-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 11/27/12 4:55 PM

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [ayk['jacknkenny'/223, l='MpServer', x=41.04, y=52.62, z=-7.60]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (110,64,91), Chunk: (at 14,4,11 in 6,5; contains blocks 96,0,80 to 111,255,95), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 4996976 game time, 5102024 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 138 total; [ayk['jacknkenny'/223, l='MpServer', x=41.04, y=52.62, z=-7.60], px['item.item.string'/86, l='MpServer', x=41.56, y=43.13, z=-12.88], px['item.item.string'/87, l='MpServer', x=34.88, y=46.13, z=-8.63], qp['Spider'/23, l='MpServer', x=-37.72, y=57.00, z=46.84], qn['Skeleton'/22, l='MpServer', x=-34.50, y=26.00, z=16.50], qr['Zombie'/24, l='MpServer', x=-36.50, y=57.00, z=50.50], oy['Chicken'/28, l='MpServer', x=-29.47, y=21.00, z=32.47], qc['Creeper'/34, l='MpServer', x=-2.50, y=33.00, z=36.50], ow['Bat'/35, l='MpServer', x=-2.19, y=50.71, z=69.28], oy['Chicken'/32, l='MpServer', x=-6.53, y=78.00, z=-39.56], px['item.item.dyePowder.black'/33, l='MpServer', x=-12.78, y=47.13, z=43.06], qr['Zombie'/38, l='MpServer', x=13.00, y=38.00, z=-27.56], qc['Creeper'/39, l='MpServer', x=10.50, y=76.00, z=-29.50], mg['Painting'/154, l='MpServer', x=68.06, y=65.50, z=66.00], ow['Bat'/42, l='MpServer', x=4.75, y=53.10, z=35.25], ow['Bat'/40, l='MpServer', x=11.02, y=30.59, z=21.61], oy['Chicken'/41, l='MpServer', x=10.16, y=61.00, z=19.16], qn['Skeleton'/50, l='MpServer', x=29.66, y=27.00, z=-34.31], qc['Creeper'/55, l='MpServer', x=16.03, y=29.00, z=-7.56], qr['Zombie'/54, l='MpServer', x=22.01, y=37.00, z=-28.44], ow['Bat'/53, l='MpServer', x=16.25, y=46.10, z=-20.25], ow['Bat'/52, l='MpServer', x=21.75, y=41.10, z=-20.25], qc['Creeper'/59, l='MpServer', x=19.50, y=25.00, z=10.31], qc['Creeper'/58, l='MpServer', x=20.34, y=24.00, z=11.47], ow['Bat'/57, l='MpServer', x=26.75, y=56.10, z=-4.72], qp['Spider'/56, l='MpServer', x=31.28, y=36.00, z=-15.03], qp['Spider'/63, l='MpServer', x=20.17, y=41.00, z=4.28], ow['Bat'/62, l='MpServer', x=25.75, y=44.10, z=5.25], ow['Bat'/61, l='MpServer', x=20.38, y=46.10, z=1.75], ow['Bat'/60, l='MpServer', x=25.28, y=44.10, z=5.72], qc['Creeper'/68, l='MpServer', x=16.06, y=37.00, z=7.34], qr['Zombie'/69, l='MpServer', x=23.99, y=26.00, z=16.59], qn['Skeleton'/70, l='MpServer', x=25.50, y=38.00, z=27.07], qr['Zombie'/71, l='MpServer', x=22.50, y=44.00, z=18.50], qr['Zombie'/64, l='MpServer', x=19.69, y=33.00, z=4.36], qp['Spider'/65, l='MpServer', x=19.17, y=46.00, z=14.99], qr['Zombie'/66, l='MpServer', x=16.91, y=42.00, z=14.44], qn['Skeleton'/67, l='MpServer', x=16.25, y=32.28, z=2.46], qz['arrow'/76, l='MpServer', x=36.04, y=52.13, z=-28.34], px['item.item.arrow'/77, l='MpServer', x=45.72, y=50.13, z=-21.94], px['item.item.arrow'/77, l='MpServer', x=45.72, y=50.13, z=-21.94], lz['Experience Orb'/78, l='MpServer', x=44.25, y=50.25, z=-22.25], lz['Experience Orb'/79, l='MpServer', x=47.59, y=49.25, z=-24.97], px['item.item.bone'/72, l='MpServer', x=38.47, y=11.13, z=-17.19], qd['Enderman'/73, l='MpServer', x=37.66, y=25.00, z=-21.47], qc['Creeper'/74, l='MpServer', x=36.36, y=39.00, z=-30.98], qz['arrow'/75, l='MpServer', x=36.75, y=52.66, z=-29.00], qp['Spider'/85, l='MpServer', x=34.72, y=46.00, z=-9.66], qr['Zombie'/84, l='MpServer', x=47.04, y=22.00, z=-6.38], px['item.item.string'/87, l='MpServer', x=34.88, y=46.13, z=-8.63], px['item.item.string'/86, l='MpServer', x=41.56, y=43.13, z=-12.88], ow['Bat'/81, l='MpServer', x=43.63, y=28.10, z=-3.06], px['item.item.seeds_melon'/80, l='MpServer', x=36.13, y=50.13, z=-25.63], qn['Skeleton'/83, l='MpServer', x=45.53, y=22.00, z=-5.88], qn['Skeleton'/82, l='MpServer', x=44.30, y=22.00, z=-6.70], qr['Zombie'/93, l='MpServer', x=31.43, y=28.00, z=13.27], qn['Skeleton'/92, l='MpServer', x=46.50, y=31.69, z=-6.69], ow['Bat'/95, l='MpServer', x=44.75, y=45.10, z=2.75], qn['Skeleton'/94, l='MpServer', x=45.25, y=29.00, z=1.47], qp['Spider'/89, l='MpServer', x=36.28, y=37.00, z=-2.78], qp['Spider'/88, l='MpServer', x=36.16, y=47.00, z=-8.72], ow['Bat'/91, l='MpServer', x=35.75, y=26.10, z=12.75], pk['Wolf'/90, l='MpServer', x=32.31, y=50.00, z=-1.63], oy['Chicken'/102, l='MpServer', x=36.83, y=56.62, z=0.27], ow['Bat'/103, l='MpServer', x=40.25, y=32.10, z=17.56], oy['Chicken'/100, l='MpServer', x=36.30, y=56.62, z=0.71], oy['Chicken'/101, l='MpServer', x=36.20, y=56.46, z=0.12], oy['Chicken'/98, l='MpServer', x=36.82, y=56.49, z=0.79], oy['Chicken'/99, l='MpServer', x=35.78, y=56.59, z=1.32], ow['Bat'/96, l='MpServer', x=32.25, y=38.10, z=1.25], qr['Zombie'/97, l='MpServer', x=37.09, y=36.00, z=11.22], qc['Creeper'/108, l='MpServer', x=46.50, y=18.00, z=54.50], qn['Skeleton'/109, l='MpServer', x=40.50, y=40.00, z=69.50], qn['Skeleton'/106, l='MpServer', x=40.50, y=25.00, z=48.50], qc['Creeper'/107, l='MpServer', x=47.50, y=18.00, z=54.50], qr['Zombie'/104, l='MpServer', x=39.34, y=45.00, z=35.01], qo['Slime'/105, l='MpServer', x=39.34, y=20.00, z=49.56], qn['Skeleton'/119, l='MpServer', x=60.41, y=24.00, z=6.13], ow['Bat'/118, l='MpServer', x=51.59, y=30.10, z=1.25], px['item.item.seeds_melon'/80, l='MpServer', x=36.13, y=50.13, z=-25.63], qn['Skeleton'/117, l='MpServer', x=56.53, y=48.00, z=-11.09], qn['Skeleton'/116, l='MpServer', x=66.22, y=62.00, z=-6.72], qr['Zombie'/115, l='MpServer', x=54.50, y=34.00, z=-8.78], qn['Skeleton'/114, l='MpServer', x=47.50, y=22.00, z=-4.63], px['item.item.bone'/72, l='MpServer', x=38.47, y=11.13, z=-17.19], ow['Bat'/113, l='MpServer', x=63.69, y=17.09, z=0.43], ow['Bat'/112, l='MpServer', x=50.25, y=31.10, z=-0.28], qn['Skeleton'/127, l='MpServer', x=56.87, y=59.00, z=33.50], qn['Skeleton'/126, l='MpServer', x=53.97, y=61.00, z=35.50], qn['Skeleton'/125, l='MpServer', x=68.43, y=55.00, z=16.05], qc['Creeper'/124, l='MpServer', x=53.43, y=41.00, z=8.03], qp['Spider'/123, l='MpServer', x=51.72, y=46.00, z=1.72], qn['Skeleton'/122, l='MpServer', x=63.50, y=30.00, z=5.88], qr['Zombie'/121, l='MpServer', x=59.08, y=28.00, z=1.19], qn['Skeleton'/120, l='MpServer', x=55.06, y=28.00, z=13.59], qu['Villager'/137, l='MpServer', x=57.69, y=64.00, z=48.69], qo['Slime'/136, l='MpServer', x=58.78, y=14.00, z=53.78], oz['Cow'/139, l='MpServer', x=70.50, y=72.00, z=-46.63], qc['Creeper'/141, l='MpServer', x=69.99, y=36.00, z=-30.56], qc['Creeper'/140, l='MpServer', x=70.66, y=36.00, z=-31.72], qr['Zombie'/143, l='MpServer', x=82.50, y=31.00, z=-10.28], qd['Enderman'/142, l='MpServer', x=68.63, y=30.00, z=-14.31], qn['Skeleton'/129, l='MpServer', x=51.50, y=64.00, z=23.50], qn['Skeleton'/128, l='MpServer', x=54.09, y=63.00, z=20.50], qu['Villager'/131, l='MpServer', x=53.31, y=64.00, z=44.31], qc['Creeper'/130, l='MpServer', x=62.50, y=54.00, z=34.50], qu['Villager'/133, l='MpServer', x=57.25, y=64.00, z=45.96], qu['Villager'/132, l='MpServer', x=54.25, y=64.00, z=46.56], qu['Villager'/135, l='MpServer', x=57.50, y=64.00, z=46.97], px['item.item.dyePowder.black'/33, l='MpServer', x=-12.78, y=47.13, z=43.06], qu['Villager'/134, l='MpServer', x=57.70, y=64.00, z=44.30], pk['Wolf'/152, l='MpServer', x=79.47, y=60.00, z=42.50], mc['entity.ItemFrame.name'/153, l='MpServer', x=77.50, y=66.50, z=42.94], mg['Painting'/154, l='MpServer', x=68.06, y=65.50, z=66.00], qo['Slime'/156, l='MpServer', x=87.93, y=37.00, z=-57.66], oz['Cow'/157, l='MpServer', x=91.03, y=68.00, z=-26.97], oz['Cow'/158, l='MpServer', x=92.13, y=68.00, z=-16.03], pe['Sheep'/159, l='MpServer', x=84.34, y=67.00, z=-8.94], ow['Bat'/144, l='MpServer', x=68.68, y=16.11, z=-3.96], oy['Chicken'/145, l='MpServer', x=78.53, y=67.00, z=-3.53], qr['Zombie'/146, l='MpServer', x=69.50, y=28.00, z=13.50], qn['Skeleton'/147, l='MpServer', x=66.41, y=26.00, z=4.51], qn['Skeleton'/148, l='MpServer', x=70.00, y=26.00, z=4.38], qn['Skeleton'/149, l='MpServer', x=66.53, y=26.00, z=9.19], pk['Wolf'/150, l='MpServer', x=78.53, y=60.00, z=42.53], pk['Wolf'/151, l='MpServer', x=78.56, y=60.00, z=41.53], oz['Cow'/170, l='MpServer', x=107.81, y=76.00, z=-21.03], qn['Skeleton'/169, l='MpServer', x=106.50, y=19.00, z=-26.50], oz['Cow'/168, l='MpServer', x=105.31, y=78.00, z=-36.59], oz['Cow'/173, l='MpServer', x=119.25, y=76.00, z=-3.38], oz['Cow'/172, l='MpServer', x=120.75, y=71.00, z=-59.50], pk['Wolf'/163, l='MpServer', x=85.50, y=60.00, z=39.88], pk['Wolf'/162, l='MpServer', x=83.69, y=59.00, z=40.69], pk['Wolf'/161, l='MpServer', x=80.41, y=60.00, z=42.88], qc['Creeper'/160, l='MpServer', x=89.00, y=14.00, z=13.53], qn['Skeleton'/167, l='MpServer', x=108.50, y=19.00, z=-32.50], qr['Zombie'/166, l='MpServer', x=110.50, y=19.00, z=-37.50], qp['Spider'/164, l='MpServer', x=78.66, y=64.00, z=33.88]]
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 (amd64) version 6.1
Java Version: 1.7.0_04, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 283718912 bytes (270 MB) / 648740864 bytes (618 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 2216 (124096 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
LWJGL: 2.4.2
OpenGL: GeForce GT 525M/PCIe/SSE2 GL version 4.2.0, NVIDIA Corporation
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: 331 (18536 bytes; 0 MB) allocated, 13 (728 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 f3d4b4f2 ----------