Why type of clients are you using ?
From the cli can you run this command :
iap_test# show clients
Client List
-----------
Name IP Address MAC Address OS Network Access Point Channel Type Role Signal Speed (mbps)
---- ---------- ----------- -- ------- ------------ ------- ---- ---- ------ ------------
10.0.0.17 00:11:22:33:44:55: test iap_test 161 AN test 32(good) 58(good)
iap_test# show radio config