Thanks for the suggestion, Damian.
No, didn’t have Ajax turned on. When I turned it on for the affected forms, the forms reappeared.
HOWEVER, still seeing the JavaScript errors pointing to wppopups.js:817 shown in my initial post. In addition, am also seeing a “style” tag artifact with no rule in the Gravity Form wrapper left over apparently from the style=”display: none” inline rule that was there previously.
Again, deactivating the WP Popups plugin fixes all these issues.
