I have the same issue. I am logged in to studio as admin, but each time i look into "site preview" or "page view" or attempt to see uploaded image, I see the same blank page even after i click on "create profile". How to "create profile"?  Also when I click in Marketplace "download" for free apps like "Developer", "Accounts", they all remain in status "Queued". Mine installation is on localhost, not on hosting, I just want to get familiar with interface