Hmmm. If you can't find the threads, and you don't read your email, how will we tell you?
Go to the following link:
Then browse through, and click on the threads in which you are interested. Sometimes, when the archives are being updated (or otherwise maintained), you will get the message you describe. The trick is to wait and try again later. Or start at the beginning (i.e. the url listed above), since the bookmark addresses are absolute pointers, and lose their validity after maintence.