Vanity alert... I use Windows XP Home. This annoyance began last week: When I click on the scrollbar with the mouse, the display drops down two screens instead of one. If I hit the "page down" key instead, it behaves normally, dropping down one screen. My wife, at her workplace, uses Windows XP Professional and has the same problem. I read on a tech thread that perhaps a Windows Critical Update that was uploaded last week might be the cause of this? Wonder if anyone else noticed a problem or has a cure?