I just changed the passwords for several SSIDs in the controller and clients can still connect with the old password.  After making the password changes, I ran a test to ensure the changes were working.  To my surprise, the test PC connects to the network using its existing configuration and I am never prompted for a new password.  After confirming the SSID configuration in the controller, I did a forced provision on all the APs and the problem remains.  Suggestions?
 
UPDATE:  I found the problem (and the fix).  The WLAN SSID password changes were made in the WLAN Default group, which is only used by my gateway.  My APs use a different group that does not have all the SSIDs of the Default group.  It turns out that any changes made to an SSID in a particular group are not carried over to the same SSID in a different group.  If the same SSID exists in more than one group, it must be edited separately.