Yesterday and Today, I have been having a lot of fun but also a lot of trouble with FTB. On the first world that i made, i was mining in a ravine and then the game crashed. I thought this was normal, but when i got back on to play again, my world was deleted. This happened to me a second time on another world i made in the Twilight forest. The game crashed, i opened it back up, and my world was deleted. Can someone please tell me how to get this fixed or what to do? I want to be able to make some progress in FTB but i can't if this keeps on happening to me, thanks!