So, I've fired a missile into the penultimate alien. I press down to get a better view of my final target. I prepare to attack, annnnnd... the game crashes. I've had several crashes on multiple maps while switching to lower levels. It's not constant. Usually, it works, but I haven't seen any pattern. It has only crashed when I used down. The 'S' key seems to work, but that may be only because I use it less. Really, it just seems to crash when I'm doing well. If it's of any consequence, I'm running the Macintosh version on OSX 10.4. Please help me, I really like this game.