[Zack Tollman]

Hi there!

I just updated to bbPress 2.4 and experienced the same problem. All titles not on bbPress pages were rendered as blank titles.

It seems bbPress 2.4 introduced a new function that filters the wp_title function. As a temporary workaround that does not required bbPress plugin file changes, I have added the following to my theme’s functions.php:

/**
 * Restore non bbPress page titles.
 *
 * v2.4 of bbPress introduced a bug where titles for all non-bbPress pages were blank. This function restores order
 * without overwriting the bbPress core files. It uses the exact same function as bbPress for the titles with one
 * change: if none of the bbPress queries match, it returns the original title.
 *
 * The function first removes the bbPress filter that performs this action, then uses it's own routine to determine the
 * title.
 *
 * @param  string    $title          Optional. The title (not used).
 * @param  string    $sep            Optional, default is '»'. How to separate the various items within the page title.
 * @param  string    $seplocation    Optional. Direction to display title, 'right'.
 * @return string                    Modified title.
 */
function my_prefix_bbp_title( $title, $sep, $seplocation ) {
	// Get rid of the core "bbp_title" filter callback
	remove_filter( 'wp_title', 'bbp_title', 10, 3 );

	// Store original title to compare
	$_title = $title;

	// Title array
	$title = array();

	/** Archives **************************************************************/

	// Forum Archive
	if ( bbp_is_forum_archive() ) {
		$title['text'] = bbp_get_forum_archive_title();

	// Topic Archive
	} elseif ( bbp_is_topic_archive() ) {
		$title['text'] = bbp_get_topic_archive_title();

	/** Edit ******************************************************************/

	// Forum edit page
	} elseif ( bbp_is_forum_edit() ) {
		$title['text']   = bbp_get_forum_title();
		$title['format'] = esc_attr__( 'Forum Edit: %s', 'bbpress' );

	// Topic edit page
	} elseif ( bbp_is_topic_edit() ) {
		$title['text']   = bbp_get_topic_title();
		$title['format'] = esc_attr__( 'Topic Edit: %s', 'bbpress' );

	// Reply edit page
	} elseif ( bbp_is_reply_edit() ) {
		$title['text']   = bbp_get_reply_title();
		$title['format'] = esc_attr__( 'Reply Edit: %s', 'bbpress' );

	// Topic tag edit page
	} elseif ( bbp_is_topic_tag_edit() ) {
		$title['text']   = bbp_get_topic_tag_name();
		$title['format'] = esc_attr__( 'Topic Tag Edit: %s', 'bbpress' );

	/** Singles ***************************************************************/

	// Forum page
	} elseif ( bbp_is_single_forum() ) {
		$title['text']   = bbp_get_forum_title();
		$title['format'] = esc_attr__( 'Forum: %s', 'bbpress' );

	// Topic page
	} elseif ( bbp_is_single_topic() ) {
		$title['text']   = bbp_get_topic_title();
		$title['format'] = esc_attr__( 'Topic: %s', 'bbpress' );

	// Replies
	} elseif ( bbp_is_single_reply() ) {
		$title['text']   = bbp_get_reply_title();

	// Topic tag page
	} elseif ( bbp_is_topic_tag() || get_query_var( 'bbp_topic_tag' ) ) {
		$title['text']   = bbp_get_topic_tag_name();
		$title['format'] = esc_attr__( 'Topic Tag: %s', 'bbpress' );

	/** Users *****************************************************************/

	// Profile page
	} elseif ( bbp_is_single_user() ) {

		// Current users profile
		if ( bbp_is_user_home() ) {
			$title['text'] = esc_attr__( 'Your Profile', 'bbpress' );

		// Other users profile
		} else {
			$title['text']   = get_userdata( bbp_get_user_id() )->display_name;
			$title['format'] = esc_attr__( "%s's Profile", 'bbpress' );
		}

	// Profile edit page
	} elseif ( bbp_is_single_user_edit() ) {

		// Current users profile
		if ( bbp_is_user_home_edit() ) {
			$title['text']   = esc_attr__( 'Edit Your Profile', 'bbpress' );

		// Other users profile
		} else {
			$title['text']   = get_userdata( bbp_get_user_id() )->display_name;
			$title['format'] = esc_attr__( "Edit %s's Profile", 'bbpress' );
		}

	/** Views *****************************************************************/

	// Views
	} elseif ( bbp_is_single_view() ) {
		$title['text']   = bbp_get_view_title();
		$title['format'] = esc_attr__( 'View: %s', 'bbpress' );

	/** Search ****************************************************************/

	// Search
	} elseif ( bbp_is_search() ) {
		$title['text'] = bbp_get_search_title();
	} else {
		return $_title;
	}

	// This filter is deprecated. Use 'bbp_before_title_parse_args' instead.
	$title = apply_filters( 'bbp_raw_title_array', $title );

	// Set title array defaults
	$title = bbp_parse_args( $title, array(
		'text'   => '',
		'format' => '%s'
	), 'title' );

	// Get the formatted raw title
	$title = sprintf( $title['format'], $title['text'] );

	// Filter the raw title
	$title = apply_filters( 'bbp_raw_title', $title, $sep, $seplocation );

	// Compare new title with original title
	if ( $title === $_title )
		return $title;

	// Temporary separator, for accurate flipping, if necessary
	$t_sep  = '%WP_TITILE_SEP%';
	$prefix = '';

	if ( !empty( $title ) )
		$prefix = " $sep ";

	// sep on right, so reverse the order
	if ( 'right' === $seplocation ) {
		$title_array = array_reverse( explode( $t_sep, $title ) );
		$title       = implode( " $sep ", $title_array ) . $prefix;

	// sep on left, do not reverse
	} else {
		$title_array = explode( $t_sep, $title );
		$title       = $prefix . implode( " $sep ", $title_array );
	}

	// Filter and return
	return apply_filters( 'bbp_title', $title, $sep, $seplocation );
}

add_filter( 'wp_title', 'my_prefix_bbp_title', 9, 3 );