As some of you know, I recieved my Halo 3 copy today from the Pontiac contest. I have been playing campaign fine by myself for about an hour. My brother just got here and we went in to do some splitscreen co-op campaign, and bam... Theres black bars on the left and right side of the screen! I tried going through every setting, reading the manual, checked my Xbox360 settings but it wont change! Any suggestions (or anyone else with their copy confirm this issue?) Thanks.