I use Sony Vegas Platinum Pro 9. I'm a newbie. I've been editing some clips. When I render them and play them on my HDTV they look fine—they fill the whole screen. I went back in, added some JPEG files, and now, once rendered, the clips have windowboxing on my HDTV—i.e., I've got black bars on all four sides of the film, throughout the film, even though the aspect ratio of the reduced image is still widescreen. I'm assuming it's the addition of the JPEGs that's causing the problem? The dimensions on the JPEGs are 720 X 480. How can I incorporate the JPEGs but keep the clip to where it fills the entire TV screen? I'd even be fine with the JPEGs themselves having pillars or letterboxing, as long as the motion picture clips themselves fill the HDTV screen. Any help is greatly appreciated!