I noticed something strange. I used a portal gun for my world, placed one in my base and placed one far away in a magical forest from Thaumcraft 4. I chop down a thaumcraft silverwood tree, break some blocks, leave to my portal to my base. Then, I decide to come back and chop down another tree, and then I notice the strange part. Everything I chopped down and blocks I broke are just there like they haven't been touched. Everything is normal. I decide to break blocks, and repeat the process, go back to my forest and the blocks again, are like they have never been touched. Is this an issue with the portal gun mod or is it an issue with my world? I did some more tests, and it looks like my world does not want to save data. e.g. I place blocks, log out and log in, and nothing is saved, and the blocks are gone. It's like it reverts save after I leave the world.