There is a very easy work around for this. You have to close all instances of IE 7 and then start IE 7 again and proceed to their web site.

But you are absolutely correct, they did not test this properly.

The problem: After siging into Marriott.com if you let your session go unattended for a period of time it automatically logs you out. It then provides you a logon screen, which even when you use a correct password doesn't work. The really bad thing is that you cannot go to any other part of Marriott's site, because it just sends you back to this expired sesssion logon screen (that doesn't work).