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When loading the page editor my users are unable to load the page building tools.
It appears in the latest update, the javascript on page is looking for an undefined key panelsOptions.row_layouts.default and also panelsOptions.row_layouts.migrations
However in wp-content\plugins\siteorigin-panels\inc\admin.php:366 where you localize, you are creating row_layouts as an empty array by default.
‘row_layouts’ => apply_filters( ‘siteorigin_panels_row_layouts’, array() );
I believe this only affects users using the classic editor.