Are you in a cluster environment with a mobility conductor?That is my case, and if I look at the web gui for an individual controller, I see what you describe - 0 down APs in the top banner, and 0 down APs in the "pie chart." You must look at the gui of the conductor. Which in my case when I do, I see a "Down AP" button in the banner, and also the pie chart there reflects down APs (Managed Network->Dashboard->Infrastructure).
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