After completing the first tutorial mission, where you fight and kill the Templar captain, I'm returned to the Animus. I go back into the large doorway for the second time and am presented with a loading screen (black screen with a blinking white box) that never completes. If I force-quit the game and load back in, I get the screen where I can control Ezio in that virtual area, but the loading screen again never ends, and I can't even load any of the tutorials. So far this has happened in two different profiles.