Yigit – and All –
Here’s a follow up on this burger menu error and solution you provided.
Ultimately the “fix” you provided disallowed all Avia Builder components to display on pages. SO – instead I did a clean update and just commented out line 107 (Fatal error: Call to undefined function avia_is_burger_menu() in /nas/content/staging/cpv/wp-content/themes/enfold/includes/helper-responsive-megamenu.php on line 107).
This is working and seems that all is functioning normally across the site. Still no clue as to why this one site has the issue. BUT – Enough time was spent by all. I thank each of you for your time.
Close the ticket please.