Hi I'm not great at posting things as you may notice, but i need help with ftb infinity. I updated it from version 3.2.1 to 5.1. I do not have any extra mods added. When I load a new world and play a bit then go off and back to title page then try reload my world, everything I've done has disappeared as if I am starting a new world but only my inventory remains. What can I do to sort the problem out? Can one of you intelligent people please help?