The network I'm having trouble with is set to B/G/N mode (that's what I infer from "Mixed." It lists Mixed, B-Only, G-Only, BG-Mixed, NG-Mixed, and N-only.) I doubt there's anything older than a G adapter connected though (typically a bunch of recent Blackberries and iPhones, laptops with G or newer adapters, and my N900) so it could be operating in NG mode, but the Wireless status just shows "Mixed."