I recently upgraded our core 6509s to Sup720s. When I did all of our 1200 series APs stopped working. They were all running 12.3(7)JA. I noticed that the one running 12.3(4) is still working. Does anyone know if there is an interoperability problem with 12.3(7)JA and the Sup720s. I am really not looking forward to visiting each AP and upgrading them.