While trying to complete Cluster 10 of Subject 16s truth video I got stuck under a set of those red stairs and couldn't get out. Quite the game, came back and what do you know, Desmond is now in Italy instead of Ezio. I have no sword, dagger, cross bow, and can't pick up any other weapons. Only one hidden blade is shown/functional but sometimes I can get the second one work even though you don't see it. I've tried everything and now I getting ****ed. It was funny at first but its just glitching out all over the place and getting anything done is becoming a huge pain. Getting the feeling I'll have to replay the game.
Here's a few shots of Desmond tour of Italy.