Assassin's Creed 2 gets stuck at the cut-scene where:
Leonardo DiVinci repairs your hidden blade, just as you get it.
I can open the map, options dialog, and change weapons but the cut-scene will not proceed.
I have tried replaying this memory several times, but it does not help.
I am running AC2 on Steam via UPlay (Windows 7, SP1, 64 bit). This is a legit copy.
Googling around suggests some others are having issues with this scene as well, but the issues seem to be with pirated copies only.