Looks like more and more people face this problem: unable to look around with a mouse. I can't reproduce this bug on my machines so I need your help to investigate this issue.

Ok. If you hase this issue, please try to do following actions and post your results below:

1. Try to restart game in fullscreen mode.
2. Try to restart game in windowed mode.
3. Try to turn on "Mouse Smooth" option in "Settings > Controls > Mouse".
4. Try to turn off "Mouse Smooth" option.
5. Try to set 15 for "Mouse Sensitivity" in "Settings > Controls > Mouse".
6. Try to set 5 for "Mouse Sensitivity" in "Settings > Controls > Mouse".
7. Check if "Logs" folder exists near the game's executable.
8. What system you use: 32-bit or 64-bit?