Zen usage addon

Anyone else getting the following error with the FF Zen usage addon.


Failed to login to remote server. The provided authentication GUID is invalid or the cache has expired. You should re-authenticate to the web service to request a new authentication GUID and establish a new cache item.

Whats the fix? It's annoying everytime you open the browser.

Stopped doing it now must have been a server problem after the web site maintenance.