I have managed to create and play a world and reload it earlier today (bought game today). However, for last couple of hours, when trying to load old world or create / load a world, I only get to 10% loaded and the game just stops doing anything. No errors.
System = Intel i5, 3.3GHz, 64 bit OS - Win 7, 16GB RAM, GeForce GTX570 I have java 64 bit installed product ver = 1.08_25