I suggest you stop using a hidden ssid and mac filtering. Those are not bringing any advantage anyway. Also, give ''ifconfig rsu0 debug'' a try. As you may have noticed, "status: active" in ifconfig's output will tell you whether you are connected or not.
-- Jérémie Courrèges-Anglas GPG Key fingerprint: 61DB D9A0 00A4 67CF 2A90 8961 6191 8FBF 06A1 1494