For some reason when playing games and exiting the game the screen on my laptop(Dell Inspiron) goes black. If I disable the Defense+ then everything works fine. I’m not sure why this is causing the problem but I’m not the only one having it. I only stumbled on this while I was googling my problem and found someone else with the same problem. They too were running windows 7 64bit. I don’t know if this is happening on the 32bit version.
Do you see anything logged regarding your game under View Defense + Alerts (Defense + → Common Tasks)? Can you post a screenshot?