We would like to force you first read forum rules regarding bug reports: http://www.minibb.com/forums/7_843_0.html#msg25843
If it works here, and if it works on minibb demo
, that could mean the problem comes somewhere exclusively on your side. So we could determine what's wrong only investigating your own server, at the very deep level, seeing what happens in database etc. Without debugging, we have no ideas what's wrong.
I would recommend still to change your forums encoding from iso-8859-1
(if it's set up that way currently) to iso-8859-2