sessions not working

<?php
session_start();
if (isset($_POST[submit])) {
if(!isset($_SESSION['cheese'])) {
$_SESSION['cheese'] = 1;
} else {
$_SESSION['cheese']++;
}
}

?>
<html><head><title>Session Test</title></head>
<body>
Current Session Variable value is: <?= $_SESSION['cheese'] ?> <br/>
<form method="post">
<input type=submit value=click name=submit>
</form>
</body>
</html>

I click it once and session variable becomes 1.

I click it again, but session variable does not increase!

Apache is 2.2.9

PHP is installed according to http://apacheguide.org/
mbstring.dll and mysql.dll extensions are uncommented
short open tag is on

PHP is 5.2.6

How to solve this problem?
.

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