Hmmm. Until you mentioned it, I hadn't noticed the checkbox "QT margins" is gone from iMovie HD 6. (For those unfamiliar, that's what we used in iMovie 5 to constrain titles within the TV Save Area.)
Scotie, are you saying the Music Video Format title is off your TV screen or outside the iDVD TV Safe Area?
When I test a title clip in the TV Safe Area of iDVD, the title is within the safe area as shown by iDVD. If so, perhaps Apple decided to abandon the "QT margins" feature and constrain
all titles within the safe area. That would make some sense, for the feature confused a lot of people.
So if your title looks fine in iDVD but is off the TV screen, then perhaps your TV needs adjusting. Or, of course, the iDVD definition may be too generous, not suitable for some TVs.
Karl