The first issue with The CMS pages:
your CMS PAges will contain a require once line to link the WA_CMS/addtosite.php page which uses a server specific path
open the CMS Admin panel and select a CMS Content area.
in the main screen click the Developer Notes link. this wil show the code for adding that content area to your page and should contain the correct path for the include line.
copy the include line, and edit your pages to use the new path.
For the Security Assist error:
This is a probelm with the session.save_path setting in the php.ini
you will need to contact godaddy support for assistance in correcting this issue.