Blogware, Firefox and secure categories

I encountered some strange behavior in Firefox when accessing the private categories in one of my Blogware blogs. Once I logged in, the contents of those categories became visible on the Main Page as they are supposed to because they are set to bubble up. But when I clicked on any secure category in the Category Tree component (or other components that link to secure categories) Firefox would log me out. I would only see the Main Page and the Login component would reappear, this time with my username auto-entered in that field. If I logged in again I would get the same result. Clearing cookies did not solve the problem. Clearing Saved Form Information fixed the problem (Tools > Options > Privacy).