Thanks for the responses, guys. That is plenty for me to go on for now.
The Heigo site gave me a message that started out by saying, "Session-Objekte konnten nicht gelesen werden." Then, it listed different versions of Internet Explorer, Netscape, etc. and (without yet translating it) I think it told me steps I needed to view the site. I will translate it further later when I have the time.
Thanks again.