I had some issue with accentuated characters in French and Firefox...
PunBB generated pages should differ of charset (changing user languages). Then, the better way, for me, is to set right the header and the meta tag...
My reference is : http://www.w3.org/TR/html4/charset.html
http://validator.w3.org/ helped me to find the problem.

Hi,

I've find some issue about char encoding and resolve it adding this line :

header('Content-Type: text/html; charset='.$lang_common['lang_encoding']);

in the header.php
Good for me...

Have I right ? smile