Sorry for the stupid question, but... how fo I switch weapon? I know that I can select different weapons using [ and ], but my character doesn't change weapon accordingly. I have tried pressing Enter, Space and the mouse buttons, but nothing worked. What am I missing?!

Thanks!

Go to options, control setup, key setup, and head over to extended controls. Whatever action button is set to is how you're going to change your weapon.

For example mine is set to the middle mouse button, while mouse wheel up and down change my weapons. z and x change my pace in how fast my guy walks or runs.