Game crashes and hangs up with me jumping in one spot after holding down jump (space Key) on keyboard while trying to go up a hill or just jumping across the map. I then have to turn off computer then boot back up, bring up the game again and then find that the save file of my world has lost it's name and is turned into a creative game from survival with the date 12/31/69 on it. In advanced edit mode the seed number is gone and so is it's name in there. I can start it back up and play it but this has happened to me 3 times now in different areas near and away from my spawn point. Hope you can fix this.