Hi Jeff. I’m not doing any processing; I’m placing a 4:3 video (which plays fine in 4:3 on any media player, with no side bars because the media players recognize its aspect ratio) into an Architect project with two 16:9 videos. On the Architect preview screen the 16:9 videos fill the screen, but for the 4:3 video there are side bars which fill in the screen width. They are not black.