I still don't understand why the Buttons mode doesn't work like the ButtonsOver mode.
If you go to your demo:
Set the Width to 390px and the ItemWidth to 120px. In IE7 it shows three items properly spaced and viewable in the rotator space. If you have ButtonsOver as the RotatorType, the scrolling looks perfect. Now if you change it to Buttons, the scrolling gets thrown off, even worse when you continue scrolling.
Why don't they work the same way? Aren't they functionally the same, the only difference being the event that raises the scrolling?