I post produce with Final Cut and sometimes Premiere. I know it's Sony based. Check the Preferences menu and click from automatic to manual as far as resizing. OR When you are outputing the video, do it manually, the program should give you prompts for deinterlacing, keyframe, yada yada, you need to find the control panel that gives you boxes that you can type in your new aspect ratio. Also make sure your aspect ratio is set on widescreen and not 4x3.
You can make the video any size you want, but just remember man, your doing 16x9, not 16x10, 4x3 or any other aspect ratio. Your pixels should match up to 16x9, like 800x450.
Maybe there is someone around that is more familiar with Vegas. I'm on a Mac.
Hope that helped, at least you know why your program is encoding title boxes if anything. Just seems like you have some of your settings on "auto"
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