I moved my osCommerce shop to my new Plesk-Server, and after that I don't receive any $_POST-Variables.
But when I moved it back it started working again.
I created a test script:
<?php
echo "<pre>";
print_r( $_POST );
echo "</pre>";
?>
<form method="POST" action="login.php?act=do">
<input type="text" name="test">
<input type="submit">
</form>
And that result is empty. Do you have any ideas?