Many times Echo Users are associated with many Sites. Which Site a User is "currently logged in" using will dictate what the user can see, download and do. The easiest way to check which Site you are logged into is in the upper right of any Echo page just left of your User Name.
To change Sites, simply click on the Site Name. A pop-up will appear and show all Sites the logged in User is associated with and the "Current Site" will have a blue border around the box. Simply find the correct Site and click on the 'Select' button in the appropriate box.