Blurry HTML5 movie on Publish

I am using the latest version of Animate CC (2017.5 release) and am trying to convert an old Flash animation to HTML5.  I opened the .fla file in Animate, did the conversion, and everything seemed great.  The converted animation plays perfectly inside Animate.  But when I use the File | Publish command, the resultant animation is quite blurry for portions of the sequence.  I don't know anything about HTML5 or Animate, but I've done a little research and seen discussions about scaling, etc.  However, there is no scaling in my animation (to my knowledge), and the fact remains that it worked great when converted to a SWF it works perfectly, and it works perfectly when playing inside Animate.  It's just when published as HTML5 that it's blurry.