Latest Steam patch
I logged onto steam today and it automatically did a patch when I clicked play. The problem is when I get to the scenario where you have to rescue Paez ( only the second part of the initial mission) two things happen: 1) I cannot use my mouse wheel button. I had to change to mouse button 4. The second problem is I cannot shoot! I can aim and zoom on the targets but I cannot fire! I know that it is the patch because I played through this scenario already in co-op. This issue came up when I was playing alone.