The Cumulative Security Update for Internet Explorer, which addresses numerous security flaws in Internet Explorer 6, introduces bugs involving the scrollbar. After the patch is applied, the page scrolls up or down twice when the user clicks once in the empty areas of the scrollbar. Clicking on the scrollbar arrows or dragging the scrollbar thumb works correctly.
This problem has been reported in Microsoft's public support newsgroups, and we have confirmed it ourselves. According to the Microsoft "MVP" monitoring the newsgroup, Microsoft is aware of the problem.