I was doing the mission where you meet Garrus and there is a point where you have to climb a ladder and the game wont let me. There is no up arrow being dispalyed.
Are you talking about on Palaven and fixing the communication tower? If that is the case you have to choose one of your squad to climb the tower, it's part of the conversation.
No i was talking about the ladder you rake up to the gun when you defend the barricade. But for some reason it's working now so alls good.