I think I've gotten the update completed for DNN 4.3.5. I need to setup a clean install of DNN 4 for testing.

Stuart, if I'm satisfied with the DNN 4 version do you want me to send the files to you?

I only changed 1 term in the code below.  This is in the ADSIProvider.vb file in the Provider.Authentication.ADSI project.  It should be around line 416 depending on any changes from above.  It's the second PopulateMembership Sub in the file.  I only changed "As String" to "As Object" and that worked for me.

        Private Overloads Sub PopulateMembership(ByVal GroupInfo As Authentication.GroupInfo, ByVal GroupEntry As DirectoryEntry)
            If Not GroupInfo.IsPopulated Then
                ' Populate membership with distinguished name
                For Each strMember As Object In GroupEntry.Properties(ADSI_MEMBER)
                    'Store DistinguishedName, this method is more accurated
                    GroupInfo.AuthenticationMember.Add(strMember)
                Next
                GroupInfo.IsPopulated = True
            End If
        End Sub