On one of our 1100 APs the wireless devices that are connected cannot ping or access each other. All devices are accessible from wired workstations, as well as from the AP itself. The affected devices can also access the other wireless devices when plugged in to the switch.
AP firmware is v12.3 and this issue has arrisen sometime in the past 30 days despite the fact that the AP has not been restarted or had any configuration changes. I did restart the AP and all devices with no success. I have also connected the devices to a different AP and then they were all able to communicate fine.
I have attached the AP's configuration. Any suggestions?