FYI - saving an empty GROUP field (no sub-fields) causes an unrecoverable error, displayed on all pages.
I recovered by renaming the plugin folder, adding a sub field (the delete button did not show); then saving (causes the error again). Then disable & re-enable 1 more time to fix.
Warning: Invalid argument supplied for foreach() in .../public_html/wp-content/plugins/meta-box/inc/meta-box.php on line 380
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