reibenreve

Greetings, I just bought Arma 2 Combined Operations recently, but have been plagued with a problem so I hope veterans here could share their insights and solutions to it. Whenever I tried to start a single player mission; the game loads fine but once I am in the game, I am only presented with the in-game scene, like a town for example, everything is working, the time is passing, the clouds are moving, the birds are flying around but I just can't do anything to start the mission. What could the problem be ? It is not just a single mission, I tried it with MODS on and Vanilla Arma 2 but the problem persist. Am I supposed to press some unique keys to get it started ? Or something is terribly wrong here ? Example: I load the single player mission for " Showcase 5: Guerilla " All I get after the load is scene and it stays there onwards. *screenshot attached* h*tp://i.imgur.com/yf89U.jpg