sounds like the .twld file is missing or something. If it was pink, that means you unloaded the mod, missing means the twld file disappeared somehow. Not much you can do about it unless you try loading the .bak files be using them to replace the normal world files (.wld and .twld)I have a problem with the crystilium biome i found the biome in my world fairly easy and i wanted to unlock the chests i got a key and went down there but the whole biome was gone. i think it was Because terraria had uninstalled itself for some unknown reason. is there anyway i can make a new biome in the same world spawn or try to "backup" my game?