SESSION not carring over to the next page.

k, it's been working all these days in my wamp local server(under Windows 7)..  i just moved the site to my hosting( Unix).. and this class stopped working.. after spending some time to figure out the problem, it looks like the Session is not carrying over to the next page..
Login works fine and redirects the user to the dashboard(when i checked the session in Login page its there), but then the dashboard says user not loaded!! i tried getting only the session, and seems session is not set..  

Code:

require_once($abs_path."inc/access.class.php");
$user = new flexibleAccess();
echo "\nxUserID = ".$user->get_property('full_name')."\n";
echo "TEST".$_SESSION['ak_userSessionValue'];

can anybody help me???

it's ok i fixed it by setting  "output_buffering=On" in php.ini...

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