OK, this is getting really weird because I just logged in to the forum as you and tried to get into the archive with each of the five links in the Members' Gateway, and I was able to access the archive successfully with all of them.
Now, I'm not doubting for a second that you're having a problem because there's no reason for you to say you are when you're not - but I do have a favor to ask. I've just added some numbers to the errors the archive's system brings up. Could you try to access the archive again when you get the chance, and then post which error number comes up for you? Hopefully that number will help me trace what's happening to you. Thanks!
