Has anyone else had a problem getting a valid serial number? I bought Simcity 4 (mac) tonight, and the serial number on the CD does not work. So, I exchanged the game for another copy. And the serial number in that one doesn't work either! I have tried uppercase, lowercase, with dashes, without dashes, nothing seems to work. Aspyr is going to have one irate customer on the phone Monday morning... I was really looking forward to playing this weekend!