I did try that and it doesn't seem to make any difference. Also, I've use Chrome and Firefox (the Chrome install was completely fresh, and I am still seeing the issue).
To give you a better idea of the environment, the Controller is installed in a Data Center and all of the APs are connected to it through a private MPLS WAN. There is an employee network (AD authenticated 802.1X) where the clients are locally bridged and a guest network (WPA2-PSK) which is tunneled to the controller. All of the APs were originally provisioned as RAPs, but in the process of the upgrade/switch over from the old 3600 I converted them all to Campus APs.
I can see all ofthe AP names in the CLI, but neither they nor the clients appear on the Dashboard tabs in the GUI.