I applied new codes at my one site, and as we can display 3 ad units + 3 link units and 2 search boxes, I placed 3 ad units and 3 link units, but this new code showing only 2 ad units and 2 link units. I think this feature is in beta and not working properly at this time. And there is also no option to generate previous kind of codes, so if its not work proper then its tension for publishers.