Problem - forge mod loader has found world id mismatches, Forge mod loader has found world id mismatches id 343 is mismatched. world: (modid: minecraft, type uv, ordinal 2) game (modid: railcraft, type rc.item.cart.furnace.Hats - ichun's blog » home to multiple minecraft mods, Info. currently for minecraft 1.6. made during a 96 hour modding marathon hosted by searge of mcp, known as modjam. this mod adds an aesthetic feature onto players. Monster 1.6.4 -beta- bug reports | feed the beast, Mod pack: monster v1.0.0 mod & version: xact v0.4.2c (in interaction with mmmpowersuits, which is not at fault but which might get the blame on superficial.