Admin Message module help with permissions

I am having some problems with the Admin message module D6 Dev release.

If i close a admin messge using the superadmin account it closes and remembers that I closed it, however authenticated users get the message everytime they refresh the page, or goto another page where that block would appear.

I was under the impression once the message has been closed, it will not be shown to the same user. Have I just misunderstood how this module works, Am i missing somthing. Please Help

Kind Regards

Niall