Is stage.AG some sort of sandbox where the admins test new features before actually releasing them? I gave the credentials I used to log in to the actual site, but they didn't work.
This should be fixed by now, it looks like you may have accessed the site while the web team was doing some work on our end. If this happens again, feel free to contact @boppins and/or @ravepenguin directly if this continues to happen for more than 5 minutes.
Thanks and sorry that you got this prompt and it caused you some confusion.