I have no idea if this is an issue regarding forge or if its related to one of the installed  mods.  What is happening is I can get into the in-game startup menu, but when I go to enter a world, the game crashes when building the new world.  I can see all the mods loaded beforehand so they seem to be working just fine.  Some research looking into the ArrayIndexOutofBounds thing lead me to looking for a 4096 id fix of some sort, which is supposedly handled by forge now... so that is why I'm here.

 

Here is the crash error:

 

22 mods loaded

Optifine OptiFine_1.2.5_HD_C3

Minecraft Forge 3.3.8.152

FML v2.2.78.153

Forge Mod Loader version 2.2.78.153 for Minecraft 1.2.5

mod_CodeChickenCore : Available (CodeChickenCore-Client 0.5.3.zip)

mod_MinecraftForge : Available (minecraft.jar)

mod_ReiMinimap : Available (minecraft.jar)

mod_BuildCraftCore : Available (buildcraft-client-A-core-3.1.5.zip)

mod_BuildCraftBuilders : Available (buildcraft-client-B-builders-3.1.5.zip)

mod_BuildCraftEnergy : Available (buildcraft-client-B-energy-3.1.5.zip)

mod_BuildCraftFactory : Available (buildcraft-client-B-factory-3.1.5.zip)

mod_BuildCraftTransport : Available (buildcraft-client-B-transport-3.1.5.zip)

mod_BuildCraftSilicon : Available (buildcraft-client-C-silicon-3.1.5.zip)

mod_AdditionalPipes : Available (buildcraft-client-DA-additionalpipes-3.1.0.zip)

mod_EE : Available (EE2ClientV1.4.6.6.jar)

ExtraBiomes XL : Available (extrabiomes-xl-2.2.6-ssp.zip)

mod_IC2 : Available (industrialcraft-2-client_1.97.jar)

mod_Forestry : Available (forestry-client-A-1.4.8.4.jar)

mod_CompactSolars : Available (mod_compactsolars-client-2.3.2.10.zip)

mod_IronChest : Available (mod_ironchests-client-3.7.0.37.zip)

mod_NotEnoughItems : Available (NotEnoughItems-Client 1.2.2.4.zip)

mod_RedPowerCore : Available (RedPowerCore-2.0pr5b2.zip)

mod_RedPowerLogic : Available (RedPowerLogic-2.0pr5b2.zip)

mod_RedPowerWiring : Available (RedPowerWiring-2.0pr5b2.zip)

mod_WirelessRedstoneCore : Available (WR-CBE Core-Client 1.2.2.3.zip)

mod_ThaumCraft : Available (ThaumCraft2.1.6d.zip)

 

 

      Minecraft has crashed!     

      ----------------------     

 

Minecraft has stopped running because it encountered a problem.

 

 

 

 

--- BEGIN ERROR REPORT bca5c4d2 --------

Generated 7/11/12 12:47 PM

 

Minecraft: Minecraft 1.2.5

OS: Windows 7 (amd64) version 6.1

Java: 1.7.0, Oracle Corporation

VM: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

LWJGL: 2.8.3

OpenGL: GeForce 9600 GT/PCIe/SSE2 version 3.3.0, NVIDIA Corporation

 

java.lang.ArrayIndexOutOfBoundsException: 28748

at zv.a(SourceFile:15)

at abn.k(SourceFile:222)

at qy.c(SourceFile:52)

at CustomColorizer.getColorMultiplier(CustomColorizer.java:377)

at vl.o(RenderBlocks.java:3441)

at vl.b(RenderBlocks.java:339)

at ct.a(WorldRenderer.java:272)

at l.a(RenderGlobal.java:1497)

at lr.a(EntityRenderer.java:1328)

at lr.b(EntityRenderer.java:1055)

at net.minecraft.client.Minecraft.x(Minecraft.java:873)

at net.minecraft.client.Minecraft.run(Minecraft.java:750)

at java.lang.Thread.run(Unknown Source)

--- END ERROR REPORT 71ca7d84 ----------

 

This seems to be an issue with your custom texture pack not proving the proper colors for grass.

The texture size should be 256x256 which makes it 65535 for that array, so ya, texture pack issue it seems.

Or something with optifine.