SecureTextBoxException in site base on CS2002StarterSite_FP1

I have a couple of sites based on CS2002StarterSite_FP1.PUP and in only one

of the sites I get a SecureTextBoxException when I link (using NavBar) to
a 
page with SecureTextBox inputs that require SSL.  In the other site which
is 
practically identical with mostly cosmetic changes, it automatically 
redirects to HTTPS.

Has anyone seen this?  Thanks in advance.

Here's the stack trace:

An unhandled exception of type 
Microsoft.Solutions.Framework.SecureTextBoxException has occurred : A
secure 
connection is required.
[source = Microsoft.Solutions.Shared]
[method call = OnLoad]
[stack trace =    at 
Microsoft.Solutions.Framework.WebControls.SecureTextBox.OnLoad(EventArgs
args)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain()]