Right.
2 reason i can think of.
1)As you haven't specified the membership settings and connectionstring the membership is derived from the default machine.config of you computer.
2)The tools is programmed with a standard asp.net database and it is using the default membership provider so by default it works.
Can you try and set the membership on your own?You need a custom membership provider and custom role provider,then bind your database on the membership provider.
If you need help on that one let me know.
P.S. How about testing it on sql, there is no way on earth that it will just work without you doing nothing on an sql server db.