[Chris M]

Ok - Try this:
Find:

PHP Code:

$template = $this->printthread ? 'bbcode_quote_printthread' : 'bbcode_quote'; 
        eval('$html = "' . fetch_template($template) . '";'); 


Above add:

PHP Code:

        // run the censor
        $text = fetch_censored_text($message);
        $has_img_tag = ($do_bbcode ? $this->contains_bbcode_img_tags($text) : 0);
        if ($has_img_tag)
        {
                $message = preg_replace('#\[img\]\s*(https?://([^<>*"]+|[a-z0-9/\\._\- !]+))\[/img\]#iUe', "handle_bbcode_url('\\1', '', 'url')", $message);
        } 


That should work

Chris