[r-a-y]

Hmm… can you check to see if the bbPress database is using some variation of utf8?

Also try looking through some threads on bbPress.org:

https://bbpress.org/forums/topic/internationalization-after-installation

https://bbpress.org/forums/topic/wrong-charset-cannot-specify-utf-8#post-3751

Would be great if you posted this on Trac, stwc!