Adding: My TV allows me to adjust the display: normal >full> wide > wide zoom....
except when it is receiving 720p!
It is stuck on "full" and it won't respond to my attempts to change it. I think if i could change the screen back to "normal" mode all would be well.
This is very bizarre. It's like the AppleTV 720p is over-riding functions that I thought should have been totally controllable through the TV.
BTW. I got it working in a centered way at 480p - but not as good resolution as it should be. In 480p it allows me to rotate my screen display through normal >full> wide > wide zoom.... 480p at "full" looks half-decent.