OK I had them reset the permissions, still no luck.
The site is no longer broken entirely, but our purchase order form still fails to work (as forms go, ORDER is critical). We have set up staging so at least we can work on the problem in our staging area, rather than breaking the form on the main site. When I submit the form, I get this PHP error:
Warning: require(/nas/content/staging/partnersinspee/wp-content/themes/x/html2pdf/html2fpdf.php): failed to open stream: No such file or directory in /nas/content/staging/partnersinspee/wp-content/themes/x-child/purchase_order.php on line 736
Fatal error: require(): Failed opening required '/nas/content/staging/partnersinspee/wp-content/themes/x/html2pdf/html2fpdf.php' (include_path='.:/usr/share/pear/php:/usr/share/php:/usr/share/pear') in /nas/content/staging/partnersinspee/wp-content/themes/x-child/purchase_order.php on line 736
WPEngine informs me they don’t cache the staging server area, so that’s not the issue.
Since this is potentially a different php error (but both triggered by updating) do you want me to start a new ticket?