I converted the MPG file to an MP4 file. Problems went away.
Is there a known preference or problem related to MPG format? I created the file from a DVD and chose MPG instead of MP4, so that is very fixable.
Also, I love the new adjustable box function in "Layer Settings" but, if you adjust the yellow borders too far, the corner handles disappear and are not recoverable easily. I had to delete the effect, then Copy/Paste from another effect that still had the handles visible.