Launcher help

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Hey folks, I'm a very active offline FTB player on Direwolf20, having run a certain world running for quite some time now. Recently (notably after I updated the mod pack) the game launches to the mojang logo then a black screen. I also use custom mob spawner, mo' creatures, gui api, and optifine, all the most current versions.

Here's the STDERR of what goes wrong - let me know if you want the whole log. I really appreciate any and all help you can offer. I've tried a complete reinstall, and launching with and without the additional mods. I borked something up good... save me?

2013-11-18 22:57:43 [INFO] [STDERR] Exception in thread "Minecraft main thread" java.lang.VerifyError: Inconsistent stackmap frames at branch target 21
2013-11-18 22:57:43 [INFO] [STDERR] Exception Details:
2013-11-18 22:57:43 [INFO] [STDERR] Location:
2013-11-18 22:57:43 [INFO] [STDERR] Config.getWorldServer()Ljs; @21: getstatic
2013-11-18 22:57:43 [INFO] [STDERR] Reason:
2013-11-18 22:57:43 [INFO] [STDERR] Type 'net/minecraft/client/model/ModelBox' (current frame, locals[0]) is not assignable to 'net/minecraft/world/chunk/Chunk' (stack map, locals[0])
2013-11-18 22:57:43 [INFO] [STDERR] Current Frame:
2013-11-18 22:57:43 [INFO] [STDERR] bci: @16
2013-11-18 22:57:43 [INFO] [STDERR] flags: { }
2013-11-18 22:57:43 [INFO] [STDERR] locals: { 'net/minecraft/client/model/ModelBox' }
2013-11-18 22:57:43 [INFO] [STDERR] stack: { 'net/minecraft/client/model/ModelBox' }
2013-11-18 22:57:43 [INFO] [STDERR] Stackmap Frame:
2013-11-18 22:57:43 [INFO] [STDERR] bci: @21
2013-11-18 22:57:43 [INFO] [STDERR] flags: { }
2013-11-18 22:57:43 [INFO] [STDERR] locals: { 'net/minecraft/world/chunk/Chunk' }
2013-11-18 22:57:43 [INFO] [STDERR] stack: { }
2013-11-18 22:57:43 [INFO] [STDERR] Bytecode:
2013-11-18 22:57:43 [INFO] [STDERR] 0000000: b200 4fc7 0005 01b0 b200 4fb4 047f 4b2a
2013-11-18 22:57:43 [INFO] [STDERR] 0000010: c700 0501 b0b2 004f b604 854c 2bc7 0005
2013-11-18 22:57:43 [INFO] [STDERR] 0000020: 01b0 2ab4 048a 4d2c c700 0501 b02c b404
2013-11-18 22:57:43 [INFO] [STDERR] 0000030: 8e3e 2b1d b604 913a 0419 04b0
2013-11-18 22:57:43 [INFO] [STDERR] Stackmap Table:
2013-11-18 22:57:43 [INFO] [STDERR] same_frame(@8)
2013-11-18 22:57:43 [INFO] [STDERR] append_frame(@21,Object[#1153])
2013-11-18 22:57:43 [INFO] [STDERR] append_frame(@34,Object[#1159])
2013-11-18 22:57:43 [INFO] [STDERR] append_frame(@45,Object[#1164])
2013-11-18 22:57:43 [INFO] [STDERR]
2013-11-18 22:57:43 [INFO] [STDERR] at java.lang.Class.getDeclaredFields0(Native Method)
2013-11-18 22:57:43 [INFO] [STDERR] at java.lang.Class.privateGetDeclaredFields(Unknown Source)
2013-11-18 22:57:43 [INFO] [STDERR] at java.lang.Class.getField0(Unknown Source)
2013-11-18 22:57:43 [INFO] [STDERR] at java.lang.Class.getField(Unknown Source)
2013-11-18 22:57:43 [INFO] [STDERR] at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:151)
2013-11-18 22:57:43 [INFO] [STDERR] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:411)
2013-11-18 22:57:43 [INFO] [STDERR] at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
2013-11-18 22:57:43 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:733)
2013-11-18 22:57:43 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source)

 

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Bump bump.