About a week ago, my worlds stopped saving when I exit on single player.
I tried a lot of ideas and looked around the Internet. I then deleted the .minecraft folder and the Minecraft launcher. I re-downloaded Minecraft and the worlds were saving on exit.
I made several worlds and all continued to save on exit. I then resumed using my regular texture pack and the worlds stopped saving.
I am suspicious that my texture pack is the source of this problem.
I saw another question and the person also downloaded a new texture pack. The thing is I've been using this texture pack since 1.8.0 and never encountered this problem. I have modified it a little, but I don't think this is the problem.
Is my texture pack broken or corrupted?
And if so, can and how can I fix it?
Update:
I got a new .minecraft folder, made a world and saved it. It saved and all was good. I then downloaded and installed optifine 1.10.2 for the new .minecraft folder. It stopped saving the worlds. I logged in and out many times and at first it was saving but gradually it stopped saving.
I don't know whether my texture pack was causing the problem because this time I used only optifine with no texture pack.
Best Answer
Its possible that your computer is full if so delete some files if not delete mine craft and download it agian this might fix the problem