I may have found a possible world corrupting bug with the scrapboxinator.
This error appeared after powering the machine and putting scrapboxes in it, crashes now on loading the world.
Display Spoiler
Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem; Ticking tile entity
A full error report has been saved to C:\Users\Jere\Downloads\MultiMc\instances\Redpower 2 Pr6\minecraft\crash-reports\crash-2012-12-23_14.49.23-server.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 accbefca --------
Full report at:
C:\Users\Jere\Downloads\MultiMc\instances\Redpower 2 Pr6\minecraft\crash-reports\crash-2012-12-23_14.49.23-server.txt
Please show that file to Mojang, NOT just this screen!
Generated 23.12.12 14:49
-- Head --
Stacktrace:
at gregtechmod.common.tileentities.GT_MetaTileEntity_Scrapboxinator.onPostTick(GT_MetaTileEntity_Scrapboxinator.java:28)
at gregtechmod.api.BaseMetaTileEntity.g(BaseMetaTileEntity.java:197)
-- Tile entity being ticked --
Details:
Name: MetatileEntity // gregtechmod.api.BaseMetaTileEntity
Block type: ID #0
Block data value: 0 / 0x0 / 0b0000
Block location: World: (450,64,1535), Chunk: (at 2,4,15 in 28,95; contains blocks 448,0,1520 to 463,255,1535), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
Stacktrace:
at yc.h(World.java:2155)
at in.h(WorldServer.java:514)
-- Affected level --
Details:
Level name: New World
All players: 1 total; [iq['Avaa'/28, l='New World', x=449,70, y=64,00, z=1535,54]]
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: -5618534467866541398
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 2;7,3x1,52x24,8x12;2;stronghold,biome_1,village,decoration,dungeon,mineshaft
Level spawn location: World: (441,4,1523), Chunk: (at 9,0,3 in 27,95; contains blocks 432,0,1520 to 447,255,1535), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
Level time: 73797 game time, 122548 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 104453 (now: false), thunder time: 89168 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:679)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fy.run(SourceFile:849)
-- System Details --
Details:
Minecraft Version: 1.4.6
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_05, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1078343080 bytes (1028 MB) / 1386938368 bytes (1322 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 2 total; -Xms1024m -Xmx2048m
AABB Pool Size: 259 (14504 bytes; 0 MB) allocated, 210 (11760 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.25 FML v4.6.12.511 Minecraft Forge 6.5.0.471 Optifine OptiFine_1.4.6_HD_U_A2 20 mods loaded, 20 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_CodeChickenCore [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_NotEnoughItems [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
IC2 [IndustrialCraft 2] (industrialcraft-2_1.112.170-lf.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerCore [RedPower] (RedPowerCore-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerBase [RP Base] (RedPowerCore-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerMachine [RP Machine] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerCompat [RP Compat] (RedPowerCompat-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerWiring [RP Wiring] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerLogic [RP Logic] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerLighting [RP Lighting] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerWorld [RP World] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerControl [RP Control] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion [Thermal Expansion] (ThermalExpansion-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion|Factory [Factory] (ThermalExpansion-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion|Energy [Energy] (ThermalExpansion-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion|Transport [Transport] (ThermalExpansion-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
GregTech_Addon [GregTech-Addon] (gregtechmod(1).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 20 (1120 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used
Player Count: 1 / 8; [iq['Avaa'/28, l='New World', x=449,70, y=64,00, z=1535,54]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'forge,fml'
java.lang.NoClassDefFoundError: ic2/core/ItemScrapbox
at gregtechmod.common.tileentities.GT_MetaTileEntity_Scrapboxinator.onPostTick(GT_MetaTileEntity_Scrapboxinator.java:28)
at gregtechmod.api.BaseMetaTileEntity.g(BaseMetaTileEntity.java:197)
at yc.h(World.java:2155)
at in.h(WorldServer.java:514)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:679)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fy.run(SourceFile:849)
Caused by: java.lang.ClassNotFoundException: ic2.core.ItemScrapbox
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 9 more
Caused by: java.lang.NullPointerException
--- END ERROR REPORT 7b3aba17 ----------