I know of nothing (in terms of offensive terms, etc) that would prevent an entire post from going through. AB's swear filters normally only block specific words, rather than whole posts.
I seem to recall having a problem once though when I'd copied and pasted text from somewhere else for inclusion here, where AB's server wouldn't accept it until I removed something from it. (I can't remember exactly what that 'something' was. I think it related to special characters, such as emoticons, that had got caught up in the text but I can't be sure).