Hello,
We recently discovered a problem with RadRotator's vertical scrolling in IE6/IE7. The problem has been fixed in the latest internal build that you can download from "Your account" section. As an immediate workaround, you can use the following fix:
Note the CSS class, assigned to the RadRotator control. The width property in the body of the CSS selector matches the width of the RadRotator. If you are using buttons for manual horizontal scrolling, decrease the width in the CSS selector by 20 pixels for each button.
Regards,
the Telerik team