Supreme theme version 1.6.1 (the latest as of Feb 2017) with the Swift Page Builder works fine with PHP 5.5.38 and PHP 5.6.30
When the same server, code, and databases are upgraded to PHP 7.015 or 7.1.1 the Swift Page Builder immediately does not work. It does not work even with no plugins activated and without a child theme.
Screenshots show how the page builder's editing sections are empty/blank so there is no way to edit a page
Downgrading from PHP 7 to PHP 5.6 makes things immediately start working again. Hence, this is consistently reproducible and linked to PHP 7.
Since the Swift Framework is part of the Supreme theme it's not possible to upgrading the Swift Framework without risk of breaking future theme updates (assuming there will be future updates).
Using the Wordpress' Classic Editor is not practical because the content is littered with Swift Builder markup.
Similar issues have been reported on the Dante theme and other places but no fix is suggested.
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