So, if you use Safari and have Tabs enabled, well, you know that line where the tabs part ends and the page begins? I can see a line on my screen from where that is! I've been noticing it for a few weeks, and, today, I decided to move my Safari window down a little bit and to the right of the screen. No line-- until a few minutes ago. WHY DOES THIS HAPPEN? Oh, and for the record: 17" iMac G5 ALS.