The polish characters work good, but the problem with the old posts still remains(polish characters still messed up there, and in one guys signature).
I think that the characters got corrupted when you transfered the posts from the phpBB board. I read on the vB board that someone else expierianced similar problems when he switched from phpBB to vBulletin.
This is probably also the case with the Chinese forum, I made a post there asking people to write something in chinese to see if the chinese characters work, but there are no replies yet.
P.S The forum looks really nice now when it is in Polish
