I have a 1GHz TiBook with 1GB RAM and ATI Radeon Mobility 9000 graphics chip. I just installed SimCity 4, the update for it, and ran it. The performance is great, except for one thing: when I scroll (every time I scroll) everything disappears. It reappears when I stop scrolling, but it's really annoying. I tried as Aspyr recommended - changing a line in the Video Cards.sgr file - to add support for the card, but it still doesn't help. Any idea?