AD auth set-up: user can''t see others

Running WIldfire 3.20 on Linux. We are authenticating to an AD server. I’‘ve got 4 groups exposed to everyone. One of our 80 users decided she didn’‘t like the way the groups were organzied and tried to move someone from one of the groups to another. Since then, she cannot see any other users and they can’'t see her. Reinstallation of her chat client and restarting the server have done nothing to cure it.

Doh! Any tips or hints?

Thanks,

tp