In my case, it turned out to be a template issue. I had to update my header.php page. Replaced <title>xxx</title> in my theme header.php with code copied from twenty-eleven. In my case:
<title><?php wp_title('«', true, 'right'); ?> <?php bloginfo('name'); ?></title>
with
<title><?php
/*
* Print the <title> tag based on what is being viewed.
*/
global $page, $paged;
wp_title( '|', true, 'right' );
// Add the blog name.
bloginfo( 'name' );
// Add the blog description for the home/front page.
$site_description = get_bloginfo( 'description', 'display' );
if ( $site_description && ( is_home() || is_front_page() ) )
echo " | $site_description";
// Add a page number if necessary:
if ( $paged >= 2 || $page >= 2 )
echo ' | ' . sprintf( __( 'Page %s', 'twentyeleven' ), max( $paged, $page ) );
?></title>
HTH