I'm playing the Linux version. I just got through the intro movie, and I'm able to click on the ground to walk around, and right-click to open the inventory, and when I move the cursor over things the names appear, but when I click them nothing ever happens and the character doesn't say anything. I can even click the icon in the corner for developer commentary, but no interaction with items at all! Am I really expected to accomplish my goals with this rather severe handicap?
Sorry, I figured out that I have to click and drag. I wish that were more obvious.