Reply without page change problem

Forum version: phpBB3

Code:

        $(document).ready(function(){
        $('.button2[name="post"]').click(function(d){
        d.preventDefault();
        $.post("/post",$('#quick_reply').serialize()+"&post=1&prevent_post=1",function(b){
        b=b.substring(b.indexOf('<meta http-equiv="refresh" content="1;url=')+42,b.indexOf('<meta name="title"')-2);
        $(".post:last").after('<div style="display: none;" class="ajax_post"></div>'),$(".ajax_post:last").load(b+" .post:last",function(){
        $('.ajax_post').slideDown(500);
        $('.sceditor-container > textarea').val('');
        });
        });
        });
        });

It used to work flawlessly, but recently it has started to bug a lot.
Bug: If I post by quick reply, message is sent, but you can't see it. New post used to pop by slide, now it just gets stuck. I can see the message, when I manually refresh the page.
So the question is - what is wrong?
Big hopes on @JScript

Any ideas? @JScript

Tonight wrote:Any ideas? @JScript

Well, if worked normally before, there must be some error or conflict with another code!

I need the address of your forum to check, okay?

JS

Sent via PM.