Thanks! That worked like a charm. :thumbsup:
I may have some answers too. When I first installed this contribution I couldn't create coupons either. It had something to do with the field values not being received. I changed all insert and update values in coupons.php to $_POST[""] values and then everything worked.
example
tep_db_input($coupons_description) . "', '" .
tep_db_input($coupons_discount_percent) ."', " .
to
tep_db_input($_POST["coupons_description"]) . "', '" .
tep_db_input($_POST["coupons_discount_percent"]) ."', " .