sessions no longer work

Hello, I have a site that was coded a while ago. I was just told that the admin side no longer works. I looked and the host recently put php 4.4.2 on the site. I have tried a few things but nothing seems to work. The problem is once you log in the admin page always kicks you back, doesn't see the session vars. What could be wrong? Here is the code: <?php require_once('Connections/db.php'); ?> <? if (isset($_POST["uname"])){

    $uname=$_POST["uname"];
    $pword=md5($_POST["pword"]);
     $SQL="select * from users where admin=1 and pword='$pword' and

uname='$uname'";

    mysql_select_db($database, $wards);

$Result1 = mysql_query($SQL, $wards) or die(mysql_error()); $affected_rows = mysql_num_rows($Result1);

    if ($affected_rows>0){
    session_start();
         $_SESSION['wardadmin']="yes";
         header("location: admin.php");
         }

else {$bad="Incorrect username and Password";} } I can echo out the session here and see yes, but I have this code in admin.php <? session_start(); if ($_SESSION['wardadmin']!="yes") { header("location: login.php"); exit; } ?> Thanks!