Hi, I just got around to playing Dishonored, nad I am having a problem. I cannot look around with the mouse!
All my other buttons work, and I also tried resetting the buttons to default, but I cannot use the mouse to look around, Corvo is stuck facing the same direction!

I think I found the problem - my Antivirus or Firewall was the culprit. I disabled everything and it works, now I just have to re-enable them one by one until I find the problem. I'm using Comodo in case anyone else has this problem.
Edit: It was Comodo's Defence+, I removed the policy on the game then set it as a trusted application and it worked!

That's very odd. Glad you found your fix!