I think I may have figured it out. Looks like photos are blurry if the users Photobucket account is "restricted" like mine. I pulled up some old posts of mine and the pics are blurred out. And, when I click on the pic to go to Photobucket I get a message saying my account is restricted because I have too many pics. Photobucket wants me to sign up for their premium plan for $6/month to remove the restriction. Bummer... lots of old posts and tutorials now have blurry images.
From the email they sent me:
"Photobucket currently hosts over 130 million photos for over 11 million free users! Effective June 1, 2019, new hosting limits will take effect that will impact a small portion of our image hosters.
What Are the New Limits?
Free hosters will be restricted to 25MB of hosting bandwidth per month. YOUR CURRENT USAGE IS OVER 25MB PER MONTH SO THIS NEW LIMITATION WILL AFFECT YOU.
What Happens If I Go Over My Bandwidth Allowance?
Free hosters, like you, who use more than 25MB of bandwidth will have all of their hosted photos watermarked and blurred."