Quote from LEGOaddict365
This is a peice of @#!*% @#!*% u @#!*% hole it screwed up my inventory and now i cant look at my @#!*% inventory
Don't be aggressive towards the developer, the new Minecraft update is what broke this mod; wait until the mod is updated and it will be fixed. Until then, use the 'Force Update' option in the Minecraft launcher and it will replace the edited minecraft.jar file with a clean one and you won't have any more issues.