Creo que sí lo solucionaron. De todas maneras, yo creo que los usé 3-4 veces. Con lo guapo que es correr por las calles y tejados de Roma, o ir a caballo de una punta a otra de la ciudad...

Update 1.04 now live in the US
I turned on my game just now and was prompted to update to 1.04 (33MB).
I am still looking for the release notes for the update.
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Animus loop bug and more fixed
Ubisoft’s bug hunting squad is busy-busy-bumblebee with another Assassin’s Creed: Brotherhood update, set to address a number of persistent issues with the title – including the game-breaking glitch where players can become stuck in an Animus loop in present-day Monteriggioni.
The full list features:
Multiplayer fixes
• Sometimes players may remain stuck during matchmaking (game never starts)
• In extremely rare occasions, a crash may occur if another player of the same session quits while another player is loading the map at the exact same time
• When joining a session In Manhunt, in the chased team, you may have a sound present during the entire session

Single-player fixes
• The player may remain stuck in the present optional (2012), in a spawning loop in Monterigioni, while interacting with the Animus (Animus Bug)
• Using fast travel towards Northern Campagna may result in Ezio getting continuously desynchronized
• Sometimes a bug can occur that prevents the player from unlocking any additional Trophies (Trophy Bug)
• On rare occasion, if the player changes their outfit at the completion of a mission, they will respawn in the same world, being stuck, without any possibility of returning to Rome