I'm not sure what you mean by having to sign in every time. When I mentioned the 'midnight sign-in' I meant that I had to give my username and my password. Do you mean username and password each time you want to access the AB site or just password?
Any other time when I go on the site I have to give my password. I presumed because two of us use the same computer, but that doesn't apply in your case.
I have the AB site in my favourites, but still have to give my password.
I'm going for lunch right now and when I sign on again, whenever that may be, I will have to give my password. Have never been able to access the AB site without signing in with password. Never bothered about it as thought it was a security measure.
But if you have to sing in with user name and password each time you want to enter I would query it with the site webmaster via the editor.