error when logged in for a period then clicking link

hi,

if i login to the site and dont log out over night and come back then click on a link in the menu bar that is password protected, instead of it redirecting to the login page i get a white page with this:

Warning: Cannot modify header information - headers already sent by (output started at /home/sites/domain.com/public_html/demo/users_Results.php:1) in /home/sites/domain.com/public_html/demo/WA_SecurityAssist/Helper_PHP.php on line 67

on the helper file this is the lines of code it references:

function WA_Auth_RestrictAccess($redirectURL){
$redirectURL = WA_Auth_BuildRedirectURL($redirectURL, FALSE, TRUE);
header("Location: ".$redirectURL);
exit();
}

does this look normal or has the helper file been generated corrupt?

many thanks

just another note, if i move the session start from the top few lines of code down under the data assist search code i no londer get the other error of cannot modify headers, headers already sent.

is there any reason why the security assist code needs to be lower down in particular pages with other code on it?

thanks

can you send a copy of the users_Results.php page that has the problem in a zip archive so I can examine the code.