I had a similiar problem, but finally got in.
Some interesting comments:
of the 1305 unenterable on site registrations, 541 or 41% were listed in the database.
7 persons voted using the address of a city of Milwaukee office building.
At the University of Milwaukee dorm / ward there were 2101 ballots cast by 1887 persons.
At least 220 (361 reported by Milwaukee Journal) felons voted.
The city allows the homeless to vote in any aldermanic district
128 used the address of a (day time only) homeless center and voted illegally.
Thanks. Will try again after I fix dinner.