Issue confirmed for some of our sites as well. Rolling back BP to 2.9.4 fixes issues in both the previous and current versions of WP. It appears to be linked to sites currently using custom group meta through an active or inactive plug-ins. I’ve noticed that removing the line: add_filter( ‘groups_custom_group_fields_editable’, ‘group_header_fields_markup’ ); from active plug-ins using the group meta template (https://codex.buddypress.org/plugindev/how-to-edit-group-meta-tutorial/) breaks the plug-in and allows the group pages to be loaded correctly. I’ve noticed that all of these functions have the $wpdb object referenced in (https://buddypress.trac.wordpress.org/ticket/7834). Perhaps there’s a connection? Otherwise, it still appears to be limited to sites using custom group meta plug-ins.
