My WordPress sites updated to 3.6 pretty smoothly.
Read More links for post excerpts are not being output by functions.php.
The fix is simple. Just change … to … in the filter.
/** * Add 'Read More' link to excerpts. */ add_filter( 'the_excerpt', 'tsg_excerpt_read_more_link' ); function tsg_excerpt_read_more_link( $output ) { global $post; return str_replace(' […]', '.. <a class="read-more" href="'. get_permalink($post->ID) . '">Read More...</a>', $output); }