ok, if you've edited in native HD, you need to output video for DVD authoring in a squeeze mode. Meaning that you should see a 4:3 picture, but everything in it is squeezed.
Then your DVD authoring software will recognise it as 16:9.
If you've output a 4:3 letterboxed image, meaning top & bottom have black bars, then your DVD should be in 4:3 mode, not 16:9.
When this happens, and if you've instructed your DVD to display 16:9, then your final output will be letterboxed within a letterbox, and picture looks squashed.
remember that no matter what, DVD are SD and PAL SD is only fixed resolution at 720x576. So 16:9 or 4:3 is still 720x576size, and the only difference is your content....4:3 squeezed for 16:9 display, letterboxed to fit 720 width in 4:3 aspect, or edge cropped.
Hope this helps.:thumbsup: