i don't know how to say it: i'm a so stupid frenchy guy.
you're right the jos_user's table has her text nad varchar fields in latin insted of utf8.
i'm affraid to be so light. I took a looking tour on the table by themselve but not inside each one.
Infact all phpbb tables are completly in utf8.
then it's working now, thanks and xcuse me
i'll looking around your nice plug-in and his features, before to use one with CH2.1.6
thx again, see you