I don't see a license for Riffworks listed on your Toneport UX8.
Did you have another Line 6 device that is not registered?
Is it possible you might have had a different username in the past?
please verify you've completed the activation: http://www.sonomawireworks.com/guide/index.php/RiffWorks_Standard
if you're still facing problems, please contact Sonoma's support in http://www.sonomawireworks.com/support.php