From the symptoms you described here and in your other post this sounds like a cookie issue. You will need to make sure that you have cookies enabled so that the site will perform correctly. If they are enabled, you may want to clear out your existing cookies to see if that helps.
EDIT: I went ahead and turned on the user notification for all of your topics so you should be notified if their are responses to the existing topics.
Edited on 1/17/2007 1:59 PM