Due to our security/authentication requirements on these demos, when users  register on our site, a "cookie" is placed on their system. If the user's privacy  settings are set to high, the browser will not accept cookies, and therefore,  the user will not be authenticated.  In order to view Mentor Graphics' Multimedia  Demonstrations, your privacy settings may not be set higher than "Medium High".  In Internet Explorer, navigate to Tools >> Internet Options. In the Internet  options window (see below) make sure you're set to Medium High or lower. Click "OK" and  re-launch your browser to initiate the new settings.