Thanks. I finally got it working again.
The hard part was trying to figure out which file to add the script to.
Had to use the function theme_head() code in my theme.php file. Once I figured that out, everything came together. Addition was as follows:
function theme_head() {
return '
<script id="twitter-wjs" type="text/javascript" async defer src="//platform.twitter.com/widgets.js"></script>
';
}
Also critical is the placement. It went immediately ahead of the //Layout section in the theme.php file
What is strange is that it worked fine for a while and then stopped working right after the changes were made on March 3rd. Probably a coincidence that sent me down a wrong rabbit hole.
Anyways, thanks for the help. Problem is solved.