yeah, it's been combined with page_title, it seems, so now the two are page_title_error().
Since my print plugin calls page_title, here's what I'm using for backwards compatibility, that seems to work:
if(method_exists(qa_html_theme_base,'page_title'))
$this->page_title();
else if(method_exists(qa_html_theme_base,'page_title_error'))
$this->page_title_error();