[sr-dev] kamailio ims (dev) and fhoss/ unregister problems.

Hello, I have an odd problem that I am not sure where to go with. I have setup kamailio dev (or the 4.0.0 branch) for IMS. I have a pcscf, icscf, and scscf using all the example config files. I also setup the fhoss for hss. This 'seems' to works great for the handful of test users I have created. The problem I have arises when a (or any) user logs out once logged out no user can logon or do anything again. If I dump all the users from the database and readd them; i am good to go again. A capture of a user trying to logon after wards always gives me this: 500 Server error on UAR select S-CSCF, which comes from the I-CSCF. I honestly have no idea what more to provide and Im not sure if this is an kamailio or hss problem... Also what is everyone using for an HSS... Do I even need an HSS can kamailio and the IMS modules do this already? Thanks,