Charles, when you're logged into the client area, the "Get in contact with us" at the bottom right of the page links to https://www.invisionpower.com/company/contact.php which gives the File not found error. It should be http://www.invisionpower.com/company/contact.php
Not sure if this is already reported via the tracker, but it seemed pertinent to the problems gmn has faced, so thought I'd mention here.