while loop works on local server but not on the production server

[genia]

the following works perfectly on the local wamp server but when i'm uploading it to the server used by the client it doesnt do nothing and gives a blank page.
also enabling errorr reporting doesnt help - the page stays blank
(

error_reporting(E_ALL);
ini_set("display_errors", 1); 
require ("security.php"); 

any ideas?

require "conf.inc";
mysql_connect($host, $username, $password);
mysql_select_db($database) or die("Unable to select database");
mysql_query("SET NAMES 'utf8'");

$sss=0;
$user = unserialize($_SESSION['user']);
$uid=$user->get_user_id();
$result2 = mysql_query("SELECT first_name,last_name FROM users WHERE id='".intval($uid)."'");
$row2 = mysql_fetch_array($result2, MYSQL_ASSOC);
$first_name= $row2['first_name'];
$last_name=$row2['last_name'];
$managername=$first_name .  " " . $last_name;
$aid = mysql_real_escape_string($_POST["aid"]);
$aname = $_POST["aname"];

$start_date = mysql_real_escape_string($_POST["start_date"]);
$end_date = mysql_real_escape_string($_POST["end_date"]);
$PaiedByAgent = mysql_real_escape_string($_POST["paied"]);

if($PaiedByAgent==""){die ("יש לרשום כמה שולם על ידי סוכן");}
$recepit = mysql_real_escape_string($_POST["recepit"]);
if($recepit==""){die("יש לרשום מספר חשובנית");}
$debt_sum = mysql_real_escape_string($_POST["DebtSum"]);
if ($PaiedByAgent > $debt_sum)
{
    echo "הסכום שהסוכן משלם גבוהה יותר מהחוב, אין אפשרות לצבור יתרה";
    die;
}
$query = "select * FROM payments WHERE agentID='$aid' AND TourDate BETWEEN '$start_date' AND '$end_date'";
$result = mysql_query($query); 

if(!$result){echo mysql_error();}


while ($PaiedByAgent > 0)
{ 

    while ($row = mysql_fetch_array($result, MYSQL_ASSOC))
    {
        $pid = $row['id'];
        $orderID = $row['orderID'];
        $AgentId = $row['AgentId'];
        $Debt = $row['Debt'];
        echo "pid: ".$pid."<br>";
        echo "orderid: ".$orderID."<br>";
        echo "AgentId: ".$AgentId."<br>";
        echo "debt: ".$debt."<br>";
        }}


        if ($Debt > $PaiedByAgent)
        {
            $Cpay = $PaiedByAgent;
            $Cdebt = $Debt - $Cpay;
$query1 = "UPDATE payments SET " . "Paid = (Paid + " . $Cpay . "), Debt='" . $Cdebt .
                "', receipt = CONCAT_WS('<br/>', receipt," . $recepit .
                "), PayDate =CONCAT_WS('<br/>', PayDate, CURDATE()), ManagerName = CONCAT_WS('<br/>', ManagerName, '".addslashes($managername) ."') WHERE id = '" .
                mysql_real_escape_string($pid) . "' ";
            $result1 = mysql_query($query1);
            if (!$result1)
            {
                echo "error: " . mysql_error();
            } else
            {
           $sss=$sss+1;
            }

            $PaiedByAgent = $PaiedByAgent - $Cpay;
            if ($PaiedByAgent == "0")
            {
                break;
            }

        }
        if ($PaiedByAgent > $Debt)
        {
            $Cpay = $Debt;
            $Cdebt = 0;
            $query1 = "UPDATE payments SET " . "Paid = (Paid + " . $Cpay . "), Debt='" . $Cdebt .
                "', receipt = CONCAT_WS('<br/>', receipt," . $recepit .
                "), PayDate =CONCAT_WS('<br/>', PayDate, CURDATE()), ManagerName = CONCAT_WS('<br/>', ManagerName, '".addslashes($managername) ."') WHERE id = '" .
                mysql_real_escape_string($pid) . "' ";
            $result2 = mysql_query($query1);
            if (!$result2)
            {
                echo "error: " . mysql_error();
            } else
            {

               $sss=$sss+1;
            }
            $PaiedByAgent = $PaiedByAgent - $Cpay;
            if ($PaiedByAgent == "0")
            {
            break;
            }
           continue 1;
          }
          
        if ($PaiedByAgent == $Debt)
        {
            $Cpay = $PaiedByAgent;
            $Cdebt = $Debt - $Cpay;
    
           $query1 = "UPDATE payments SET " . "Paid = (Paid + " . $Cpay . "), Debt='" . $Cdebt .
                "', receipt = CONCAT_WS('<br/>', receipt," . $recepit .
                "), PayDate =CONCAT_WS('<br/>', PayDate, CURDATE()), ManagerName = CONCAT_WS('<br/>', ManagerName, '".addslashes($managername) ."') WHERE id = '" .
                mysql_real_escape_string($pid) . "' ";
            $result3 = mysql_query($query1);
            if (!$result3)
            {
                echo "error: " . mysql_error();
            } else
            {
        $sss=$sss+1;
            }

            $PaiedByAgent = $PaiedByAgent - $Cpay;
            if ($PaiedByAgent == "0")
            {
                break;
            }
        }

    }
}


if($sss>0){
    $start_date = implode('-', array_reverse(explode('-', $start_date)));
    $end_date = implode('-', array_reverse(explode('-', $end_date)));
    htmls(1,$aid,$start_date,$end_date,$aname);
}else{htmls(0,$aid,$start_date,$end_date,$aname);}

function htmls($res,$aid,$start_date,$end_date,$aname){
echo "
<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">
<html xmlns=\"http://www.w3.org/1999/xhtml\">
<head>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />
<title> דוח תשלומים</title>
<link rel=\"stylesheet\" href=\"css/style.css\"  />
<link rel=\"stylesheet\" href=\"css/menu_style.css\" type=\"text/css\" />

</head>
<body>

";
display_menu_by_level();

if($res=='1'){
    echo("<div class='content'><h2>פרטי התשלום עודכנו</h2>" );
    echo "<form  method='post' action='report_by_payment2.php'>";
    echo "<input type='hidden' value='$aid' name='aid' />";
    echo "<input type='hidden' value=$aname name='aname' />
    <input type='hidden' value='$start_date' name='start_date' />
<input type='hidden' value='$end_date' name='end_date' />'
<button type='submit'>חזור</button>
";
    
}
else{
    echo "<div class='content'><h2>"."שגיאה בעדכון פרטי התשלום"."</h2>";
   
}
echo"
</div>
</body>
</html>

";
}