It has just come to my attention from Cisco TAC that there are some significatn issues with 220.127.116.11.
I thought that this would be helpful to anyone using this version or considering upgrading to it.
There is supposed to be an emergency release (18.104.22.168) available in the March/April timeframe.
Here is a summary of known bugs in 22.214.171.124:
CSCsh47906 WLC:After upgrade to 126.96.36.199, random AP reloads are observed
CSCsh45987 1020 Series LWAPP access points on Wism controller reboot randomly
CSCsh48977 WLC's IP stack becomes inoperable on a large L2 subnet
CSCsf99924 Daylight savings cannot be set
CSCsh38068 WLAN profile identifier missing from client summary screen and detail
CSCsh43557 Cosmetic: Misspelling & miswording in AP Authentication message
CSCsh47269 Upgrade to 4.0 MR2 does not enable broadcast if multicast enabled
CSCsh47364 Enter ? in debug ap command in a telnet/ssh session crash WLC
CSCsh47926 WLC: Serviceability of hardware counters/status
CSCsh49310 A Clear configuration on WLC2006 corrupts image
CSCsh49729 private MIB error of WLC
CSCsh50252 controller is unable to interpret NTP packets correctly
CSCsh50527 NPU Truncates Padding from Unicast ARP Frames
CSCsh50966 WLC does not respond to unicast ARP