Problem accessing database from xsl page

[bladesonfire]

Hi, when I try to access my CWP page, login does not work. When using Firefox, though, I notice I get this message:

Enter username and password for "" at http://server

If I enter my username and password, the same dialogue opens up. If I press escape/cancel, a new dialogue opens up:

Enter username and password for "Database MyDB" at http://server

Now if I enter my username and password, everything renders properly. Can anyone point me in the right direction? If I press cancel on the initial dialogue box in Opera or IE, the second dialogue box never shows up.

I am using IWP and CWP at the same time through the WPE and the IWP works fine. And if it makes a difference, I'm trying to share the same layout through both IWP and CWP.

Does anyone know what the problem is? Thanks.