This is most commonly caused by blocked cookies. You can find instructions on how to enable cookies by searching for "cookies" in your web browser's Help menu.
If you have enabled cookies and the problem still occurs, try using e-couch with a different browser. Users in the past have found that the web browser Firefox works well with the e-couch program. Firefox can be downloaded at no cost from www.mozilla.com.
If you don't have a username and password for the e-couch program, press on 'New Users' above to enter the registration process.