sessions no longer work

["blackwater dev" <blackwaterdev@xxxxxxxxx>]

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!