Removing CURLOPT_FOLLOWLOCATION returns empty output

Hullo,
this weekend the parsing of a web page stopped working perhaps due to a restyling of the site. The page is:
http://muovi.roma.it/paline/palina/77113?nav=4

and I m trying to parse it with the following function:

PHP Code:
function atac_get_html($url, $language){
$url='http://muovi.roma.it/paline/palina/77113?nav=4'; //manual forcing
    set_include_path("/iPhone/simplehtmldom_1_5");
    require_once('simple_html_dom.php');
    require_once('atacurl.php');
    // Create DOM from URL or file
    //$atacurl=atacurl();
    //$languageUrl=$atacurl."/lingua/set/".$language;

$languageUrl=http://muovi.roma.it/lingua/set/en";
    if (!isset($_SESSION['ckfile'])) {
echo "language".$languageUrl;
        $ckfile = tempnam ("/tmp", "CURLCOOKIE");
        $_SESSION['ckfile']=$ckfile;
/* STEP 2. visit the homepage to set the cookie properly */
        $ch = curl_init ($languageUrl);
        curl_setopt ($ch, CURLOPT_COOKIEJAR, $ckfile); 
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        $output = curl_exec ($ch);
//echo "outputInit=".$output."
";
    }
    $ckfile=$_SESSION['ckfile'];
/* STEP 3. visit cookiepage.php */
    $ch = curl_init ($url);
    curl_setopt ($ch, CURLOPT_COOKIEFILE, $ckfile); 
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    $output = curl_exec ($ch);
    curl_close( $ch );
echo $url;
echo "output=".$output;
    return str_get_html($output);
} 

Yet, when I execute it, instead of going to the url page it goes to the home. What is quite peculiar is that, if I remove the latter curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true), I have an empty output like the page had a refresh setting that does not manifest itself when connecting by a browser but it does if trying to parse it! I am totally puzzled and unfortunately that piece of code is at the core of an iOS app I have on production and so I am also quite in a hurry.
Could someone please help,

Thanks,
Fabrizio Bartolomucci