Genesis 1.9.0 change for referencing the child theme style sheet.

layout.php

<?php

// lib/structure/layout.php in Genesis 1.8.2

add_action( 'genesis_meta', 'genesis_load_stylesheet' );
/**
 * Echo reference to the style sheet.
 *
 * If a child theme is active, it loads the child theme's stylesheet,
 * otherwise, it loads the Genesis stylesheet.
 *
 * @since 0.2.2
 */
function genesis_load_stylesheet() {

	echo '<link rel="stylesheet" href="'.get_bloginfo( 'stylesheet_url' ).'" type="text/css" media="screen" />'."\n";

}

load-styles.php

<?php

// lib/css/load-styles.php in Genesis 1.9.0

add_action( 'genesis_meta', 'genesis_load_stylesheet' );
/**
 * Echo reference to the style sheet.
 *
 * If a child theme is active, it loads the child theme's stylesheet,
 * otherwise, it loads the Genesis stylesheet.
 *
 * @since 0.2.2
 */
function genesis_load_stylesheet() {

	add_action( 'wp_enqueue_scripts', 'genesis_enqueue_main_stylesheet' );

}

/**
 * Enqueue main stylesheet.
 *
 * Properly enqueue the main stylesheet.
 *
 * @since 1.9.0
 */
function genesis_enqueue_main_stylesheet() {

	$version = defined( 'CHILD_THEME_VERSION' ) && CHILD_THEME_VERSION ? CHILD_THEME_VERSION : PARENT_THEME_VERSION;
	$handle  = defined( 'CHILD_THEME_NAME' ) && CHILD_THEME_NAME ? sanitize_title_with_dashes( CHILD_THEME_NAME ) : 'child-theme';

	wp_enqueue_style( $handle, get_stylesheet_uri(), false, $version );

}

load-styles1.9.1.php

<?php

// lib/css/load-styles.php in Genesis 1.9.0

add_action( 'genesis_meta', 'genesis_load_stylesheet' );
/**
 * Echo reference to the style sheet.
 *
 * If a child theme is active, it loads the child theme's stylesheet,
 * otherwise, it loads the Genesis stylesheet.
 *
 * @since 0.2.2
 */
function genesis_load_stylesheet() {

	add_action( 'wp_enqueue_scripts', 'genesis_enqueue_main_stylesheet', 5 );

}

/**
 * Enqueue main stylesheet.
 *
 * Properly enqueue the main stylesheet.
 *
 * @since 1.9.0
 */
function genesis_enqueue_main_stylesheet() {

	$version = defined( 'CHILD_THEME_VERSION' ) && CHILD_THEME_VERSION ? CHILD_THEME_VERSION : PARENT_THEME_VERSION;
	$handle  = defined( 'CHILD_THEME_NAME' ) && CHILD_THEME_NAME ? sanitize_title_with_dashes( CHILD_THEME_NAME ) : 'child-theme';

	wp_enqueue_style( $handle, get_stylesheet_uri(), false, $version );

}