Interesting. Thanks for the resources. Here's a change that will be included in the next release. Line 344 of formidable/classes/models`/FrmEntry.php changed from:
if ( !isset($values['frm_submit_entry']) || !wp_verify_nonce($values['frm_submit_entry'], 'frm_submit_entry_nonce') ) {
to:
if ( !isset($values['frm_submit_entry']) || (is_user_logged_in() && !wp_verify_nonce($values['frm_submit_entry'], 'frm_submit_entry_nonce')) ) {
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Thanks again!