In latest diags I see this:
[ns_server:error] [2012-07-03 13:43:04] [email@example.com:<0.9898.0>:menelaus_web_alerts_srv:can_listen:330] gen_udp:open failed due to eaddrnotavail
Which implies indeed this address is not available anymore. Or at least erlang/OS thinks so.
Given we decided to avoid completing proper fix for ip address selection and we have a known workaround (pick address manually) I don't think that's must have for 2.0 and maybe even for resolving as 'Incomplete'