Just a bit curious, why are you using a wiki if
With it, I wanted to implement the following:
1) guests can only have access to main page to create account
2) new accounts also can only access main page
3) accounts added to 'membros' group can read any page, but not edit or
create pages
4) accounts added to 'autores' can read, edit and create pages
To me this is a standard CMS.
As for you question, you've got both createaccount and !createaccount for
the group * effectively giving it no rights at all. Perhaps that would do
something weird?
Regards,
Martin S