The resource cannot be found errors on page with roles

Hi,
I have created a simple site with Two secure folders and secured by roles. The folders  Secure(admin.aspx) and Members(members.aspx) and each has a web. config file in it. This works perfectly but when click on the members or admin.aspx page and try going back to the home page (default.aspx), i get the error :

The resource cannot be found. Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly. 

Requested URL: /T ...