[support] Login problem

Hello,

I just begun using Drupal today. I'm having a strange problem. It's easier to show than to explain. Here is my Drupal site:

http://drupal.opendocumentfoundation.org/index.php

Try to login.

After you press "Log in" you get a second pop-up asking for another username and password. You know when you use .htaccess to require a password? That's the one. Thing is, I didn't put this there, I don't know where it came from. It mentions "Trac" and this server does have Trac installed, but I can't see why Trac would be messing with Drupal. It doesn't make sense. I've searched for a .htaccess file that might be affecting this, and I can't find any. This is so weird.

Does anyone have any ideas?

Best, Daniel.