Just set up the Freenet6 Tunnel Broker (Authenticated).
Then tried to change the Server Address from "authenticated.freenet6.net" to "amsterdam.freenet6.net" which resulted in showing an internal reference (see screenshot)
I have tried it in opera, FF, and IE and it works fine for me too. The server changes to amsterdam.freenet6.net and I can still connect then I changed to anonymous and when I came back it was still amsterdam.freenet6.net. When I changed to sixxs.net and connected back, the server had changed to authenticated.freenet6.net again. But I never got the REFId
I have tried it in opera, FF, and IE and it works fine for me too. The server changes to amsterdam.freenet6.net and I can still connect then I changed to anonymous and when I came back it was still amsterdam.freenet6.net. When I changed to sixxs.net and connected back, the server had changed to authenticated.freenet6.net again. But I never got the REFId