You may have something wrong in your source footage or Premiere sequence settings.
But first, in Encore, right click the Premiere sequence (not the timeline), right click, and select "Interpret footage." What is the par it says (for the "Use Asset's Pixel Aspect Ratio")? Correct the par.
Are your menus correct?
Thanks for replying!
In Encore, the Premiere sequence, when I right click on it and go to interpret footage, is automatically set at: Use the asset's par: sqare pixels (1.0). Changing it to any of the other options doesn't appear to make a difference on the Monitor window or Preview window.
Regarding my footage, for some reason some of it, instead of being fullsize (4096 x 2160), is 3072 x 1620 or even smaller. Anyway, I let Premiere Pro decide on the sequence settings based on the first piece of footage I put in the sequence, which was one of the fullsize clips. The settings include square pixels 1.0. By the way, I've (top and bottom) letterboxed the 16:9 sequence so that it's 2.35.
Any further thoughts?
Match source attributes, depending on your source charactristics and the Premiere sequence settings, may overcome the defaults for MPEG2-DVD that need to stay as is. I have not tested that.
If you letterboxed in the export panels, then this has a good chance of working; if you letterboxed in the PR sequence, that will be a problem.