Configuration:
- Windows 2003 R2 Standard Server with all patches.
- Internet Explorer v7.0 with all patches.
- Favorites showing up on the left side of the window.
Problem:
Activate any sidebar (history, bookmarks, etc.) and make it wide.
Display any UNL template compliant web page, so you have to scroll to see the right part of the page.
The right part of the header shows transparency problems.
Problem disappear/reappear if the sidebar is closed/opened.
Duplication.
I was able to duplicate with multiple browsers and platforms.
Is this a known problem, or a design feature?

