Access Levels problem

Hi

I am having a problem identifying the access level permissions problem on my site. I have set all blogs, categories etc to public, and yet when I click on a link within a Latest Blogs module, it requests a password and requires login to view.

However, I have noticed that if I use the sites search functionality to locate the blog, then it allows the blog to be viewed without logging in.

Any help that you can provide would be most appreciated.