I just downloaded the minecraft weekly pre release 1.0.1 thing and everthing was fine. I had about 60 FPS and then it closed after 5 mins. and every few mins it closes. I downgraded to 1.0.0 and it still does. I put 45 iron I had just found in a furnace, then it froze. I came back on and my iron had dissapered. Fuuuuuuuuuuuuuuuuuuu-