problems with "remember me"

I've read all the blogs on this subject but I'm still having problems with the login control. If you check this box, your user name should be filled in next time, right? Following are my markup and web.config code; I'm using the ASP.Net profile system. I'd appreciate any suggestions.  <asp:Login ID="Login1" CreateUserText="New to this site? Click here to register." RememberMeSet="true" CreateUserUrl="~/reg.aspx" Width="300" Height="100" BackColor="#FFD700" BorderColor="#B5C7DE" BorderPadding="4" BorderStyle="Solid" BorderWidth="1px" Font-Names="Verdana" MembershipProvider="DNProvider" Font-Size="9pt" ForeColor="#333333" TitleText="Log in to the DNHS Alumni Site" LoginButtonText="Log In" VisibleWhenLo ...