Airport Utility won't allow extended network in version 6.1
My base station is an 802.11n Time Capsul, and I have four Express Units to stream music. I want to set one of them to extend my wireless network to strengthen the signal to a Blu Ray player with internet connections. When I set the Express to "extend a wireless network" Air Port Utility drops it from my network. Also there is no " allow this network to be extended" tab as there was in earlier editions. Otherwise the network works fine. Any ideas?
iMac, OS X Mountain Lion (10.8.2), Base station is an 802.11n Time Cap