I fixed this in my local version by modifing admin/security/Signin.ascx.vb

Changed the  RedirectURL() property on line 67

Change checks to see if Redirect After Login setting is set before checking the ReturnURL query string.  I am not sure if there would be a reason to check the returnurl first, but it seems to me that if the site administrator setup a redirect after login setting, this should take precedence.

Protected ReadOnly Property RedirectURL() As String
Get
    Dim _RedirectURL As String = ""
    Dim setting As Object = UserModuleBase.GetSetting(PortalId, "Redirect_AfterLogin")

    If CType(setting, Integer) = Null.NullInteger Then
       If Not Request.QueryString("returnurl") Is Nothing Then
          ' return to the url passed to signin
          _RedirectURL = HttpUtility.UrlDecode(Request.QueryString("returnurl"))
       ElseIf PortalSettings.LoginTabId <> -1 And PortalSettings.HomeTabId <> -1 Then
          ' redirect to portal home page specified    
   _RedirectURL = NavigateURL(PortalSettings.HomeTabId)
       Else
          ' redirect to current page
          _RedirectURL = NavigateURL(Me.TabId)
       End If
    Else ' redirect to after login page
       _RedirectURL = NavigateURL(CType(setting,Integer))
    End If
End Get
End Property

Thank you very much for posting this fix... it worked very well for me.

The mentioned files is there without having the Source-Code installed. That means the VB-File is in Source available after installing. Ergo: no recompile needed.

And you are right, in 4.5.2 it is still not fixed. Trying to install 4.5.3 this night and we will see....