Hi all, I'm new to Halo and I just installed it today. However, I'm already having problems- a white box appears in the bottom left corner of the screen where, I assume, the radar or map is supposed to appear. Also, from the point that this appears on the screen (from the middle of the very first level) whenever I'm hit the whole screen goes white for a period of a little more than a second. I'm running the non-universal binary version on my new MacBook Pro. Could anyone help me to rectify this problem?