I have a member named hentai, but I don't think the issue is because of his name because several other swear words are not off limits.
Anyways, we cannot post on his wall, say the word in PM, quote posts, reply in threads where he has posted, etc.
It's all in relation to his username however. And for some reason these issues let up by changing his name, but he doesn't want a name change.
It's just a similar error every time.