Seems strange that the Tracker is completely empty.. Verify that you don't have any filters active there (I see it says [All Requests] but still), select all servers..
I'm no Cisco guy, but - you are doing Layer 3 Passthrough. I don't think that triggers any authentication. Try Authentication, or even mac-filtering to verify that the auth records are sendt.
As a sidenote for guest - MAC Filtering is awsome, and Radius Server -> Interim Update for Accounting updates instead of just upon connection.