Go into the CF Administrator and click on "Security". You should get a pop-up that allows you to assign a password for Studio to access the server. If the box is checked, uncheck it. Go back to Studio and select "localhost" from the dropdown menu. You should then see your datasources displayed and you can select them. I have Studio 5.0, but I'm pretty sure 4.5 worked the same way when I was using it. Calista :-X
Jedi Knight,
Champion of the Force