I posted this in Bug Report too so I thought that I might get the maximum help if I post it here too (and possibly a warning or something D Me and my friend had this problem together, basically when loading up a world from a previous version it comes up with an error message about Dimension Doors, saying that it cant find the block IDs. When you continue the world loads up a few chunks but you are unable to interact with the world. You can break blocks but it doesn't yield a drop, you can't open machines etc. If you exit the world, it freezes on "Shutting down internal server". The same thing happens if you press "no" on the error message about continuing. To exit Tekkit you have to end the process. Error Message: Forge Mod Loader has found world ID mismatches ID 1971 (ModID: DimensionalDoors, type Transdimensional Trapdoor) is missing (ModID: DimensionalDoors, type SteveDimDoors.mod_pocketDim.ItemStableFabric) is missing Do you wish to continue loading? [Yes] [No] --- Anyone else having this problem or knows a solution?