User blog comment:Valogan2/trophies/@comment-24.90.242.175-20110729093850

Although I can't explain the sequence problem, I can tell you that you cannot play anything outside the Animus at the end of the game. You might want to start a new game and look around Monteriggioni (outside the Animus) for artifacts, like one on the roof of the villa, where part of it is smashed.