I am having issues with my CakePHP application. This seems to be happenining only in IE, and only on certain computers. It is consistent on the computers where it is happeni
Try putting this in your AppController's beforeFilter and see if it does anything. I have a feeling the cookie settings aren't configured like you need. See here for more info.
function beforeFilter() {
$this->Cookie->domain = '.example.com';
$this->Cookie->secure = false;
}