I had this problem, consulted the fix, and the problem is basically the same. On the checkout_confirmation.php page of my site this is what displays under Billing Address:
Billing Address (Edit)
Warning: htmlspecialchars() expects parameter 1 to be string, array given in /home/content/s/t/r/strollerroller/html/includes/functions/general.php on line 46
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If I've changed the code provided by D11on, why would this problem still exist?