It isn't my HD-DVD copy (don't ask) but it also isn't SD. In fact, it looks significantly better than a conventional DVD.
I am sooooo glad we got TCM HD.
Replace your HD-DVD (I sold mine a long time ago) with my Blu-ray, and ditto!!
could it possibly be that they've switched to "the european model" of showing native 1080i when they've got it?