Well, you might have a sessions problem, since the zenid is showing on every page and never disappearing. That is usually a result of changing the settings in Admin->Configuration->Sessions to be set to something other than the defaults.
Or it's a result of your server having different values for the domain details being set in the session cookie that is set in your browser to link the browser to the customer's session on your store.
In addition to my earlier suggestions, you might also need to do something like this:
http://www.zen-cart.com/wiki/index.p...Obscure_Issues




