ClearFoundation

Hi, I'm new to ClearOS. Just installed it in a brand new Dell T110II.
Everything was ok, registration was done and then when trying to access Marketplace, first an "Authentication required" popup appears, and when user/pwd is typed, it shows my username on "Account information", but when click on "Download an install" an application, it throws a message of "Session timed out - authentication required." and the authentication popup appears again. And now it's an infinite loop of authentication.

It turns out that the problem only occurs in Firefox 13. Using Chrome the problem doesn't appear.