I had that happen to me on unleashed firmware 200.7.10.x on a r710. Did you try rebooting it. Power cycle it? Next try a factory reset on the access point with the paper clip for 10 sec or so...
Did you up date to 200.7.10.X.... I would go back to 200.6.10.x which will reset to all default settings? By any chance you saved the settings before you updated do might be able to restore settings.?