Looks like if your using Apple Configurator to manage iPads. And are planning to upgrade them to iOS 6. Do yourself a favor, update OS to must current. I can confirm that in 10.8.1, upgrading a device to iOS 6 and supervising them. Things act a bit weird. Once I update the OS to 10.8.2, things started working again. This might hold true for 10.7.5 as well. I suspect that Apple will be releasing a newer version or updated version of AC pretty soon.
Carlos