Vista Tutorial - DVD Maker Scenes Button Windows are Blank

When I first used Windows DVD Maker inside Vista Ultimate, each "Scenes
Button" would display a small clip of the video that represented that
particular scene. So, when you picked the "Scene" button on the "menu" page,
the little windows would appear that would allow you to select a particular
scene (chapter) to go directly too. Well, regardless of how I customize or
the Menu Style I choose, I no longer haven anything but blank windows for
scene buttons, even when I view the layout in preview mode. Has anyone had
this problem, if so what is causing it? Thank you.