News comes via
Ubisoft's official forums that a fix is on the way for Assassin's Creed 2.
A bug surfaced recently that locks players in an empty hideout if they turn their consoles off during Sequence 11. When players reload the game, they're unable to use the Animus and must start a new game in order to proceed past that point.
Help is on the way though!
"We are aware of this problem, and we are glad to say that it will be solved through our upcoming patch," says a Ubisoft community dev on the forum.
Until then, the best solution is to probably make sure you're back in Renaissance Italy before exiting the game.