Yes! This is correct.

This bug was also in 4.5.1. Allthough i'm still on 4.8.1 and i haven't test it yet, i guess that the solution from these times will still work.

In Directory admin\security change the procedure RedirectURL in the File signin.ascx.vb:

 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

     Return _RedirectURL
 End Get
 End Property

That always worked in every version i tested having this bug.

Kai

PS: Do not forget to make a backup ;-)