Most of the time I play DoD on my Windows 7 desktop machine and the game is rock solid. I have noticed however that the game tends to lock up my Macbook Pro (13" 2011 model) often enough that I don't even dare playing it anymore. I don't remember having this many issues in previous versions, so I am wondering if something in the latest version is broken under OS X? If this helps, I can describe a certain place that always seems to freeze the game. On the first level, near the middle of the map there is usually a very large open area with a ton of loot lying around. Usually there is a room on the north side with a couple of Elly's guarding a cube. If I walk around this large room a couple of times I can almost guarantee that at some point the game will freeze my Mac to the point of requiring a complete power off. I tried three games today and got three lockups in this room after about 10 minutes of play each time.