you also have the same thing in invoice.php in admin as well circa line 355

Code:
<!-- BOF added to get currency type and value for totals -->
                <?php #$dbc="select currency, currency_value from " . TABLE_ORDERS . " where orders_id ='" . $_GET['oID'] . "'";
                $result = mysql_query($dbc);
                $row = mysql_fetch_array ($result, MYSQL_NUM);
                $cu = $row[0];
                $cv = $row[1];
                ?>
<!-- EOF added to get currency type and value for totals -->
hidden for now - do you know if plugin code will get updated or not? as I am not who has control of this plugin at present as it seems a few people?! was not sure how it all worked

thanks
Sarah