3.2.2 on a Windows 2000 box, SQL Express 2005, and AD is working, until the first click on link to a child portal, then get the error below.  Stry, refreshing the page with the error takes you to the portal, logged in using AD. One other quirk, I have never received a "Pass" on the LDAP test on our network.  No reply yet from our network group on why I cannot use LDAP.  Any ideas, anyone?

Server Error in '/DotNetNuke' Application.

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Value cannot be null. Parameter name: type

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null. Parameter name: type

Source Error:

[ArgumentNullException: Value cannot be null.
Parameter name: type]
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +165
   DotNetNuke.Framework.Reflection.CreateObject(String TypeName, String CacheKey) +168
   DotNetNuke.Security.Authentication.AuthenticationProvider.Instance(String AuthenticationTypeName) +68
   DotNetNuke.Security.Authentication.AuthenticationController.AuthenticationLogon() +200
   DotNetNuke.Modules.Authentication.WindowsSignin.Page_Init(Object sender, EventArgs e) +70
   System.Web.UI.Control.OnInit(EventArgs e) +67
   System.Web.UI.Control.InitRecursive(Control namingContainer) +241
   System.Web.UI.Page.ProcessRequestMain() +197

Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032