This happens in all the AC games I've played up through Freedom Cry.
Suddenly the camera view will lock, facing one direction, and nothing I do will free it up (unless I die, or quit the game).
Just now, playing Freedom Cry it locked, so that I could only see from behind my character, and only move in that direction (i.e. I couldn't turn, only go forward - and of course I was being attacked by guards from behind. Other times, it locks in various positions, the most inconvenient being when I'm in a corner, looking down. The C key to Center the camera, doesn't work. Neither do the direction (arrow) keys. They all do nothing at all..Tried remapping them and that did nothing either. Vsync is usually on, but I've tried it on and off. No difference. The files have been verified. Anyone know of a fix for this?