BuddyPress.org

WordPress and therefore BuddyPress lack a lot of standard i18n features as core developers are mainly using English than other languages. They still haven’t figured out problems we have when we use our own languages within WordPress/BuddyPress.

Anyway, for the problem, there’s similar ticket on trac that names containing dots or dash don’t work on 1.1 environment. It may be related to this ticket.