I have this for Mac, and whenever I played it, it would run fine and I would play a lot of custom maps. Now all of a sudden I can't play no matter what I do. I redownload it, take off all my mods, but it still crashes at the loading screen. The most recent time, however, it came with a notice after crashing. It said something along the lines of "You cannont play due to an error, you may need to update your computer software or game." They're both up-to-date. Why does this happen? Do the mods and custom campaigns I've already downloaded have something to do with it? And does anyone have any idea how to make it work?