diff --git a/wp-admin/css/wp-admin.css b/wp-admin/css/wp-admin.css
index 45d75c8bc2..d46b944450 100644
--- a/wp-admin/css/wp-admin.css
+++ b/wp-admin/css/wp-admin.css
@@ -3391,7 +3391,7 @@ td.plugin-title p {
 	border-style: solid;
 }
 
-#notification-dialog {
+.notification-dialog {
 	position: fixed;
 	top: 30%;
 	left: 50%;
@@ -3402,7 +3402,7 @@ td.plugin-title p {
 	z-index: 1000005;
 }
 
-#notification-dialog-background {
+.notification-dialog-background {
 	position: fixed;
 	top: 0;
 	left: 0;
@@ -3414,31 +3414,31 @@ td.plugin-title p {
 	z-index: 1000000;
 }
 
-#notification-dialog .post-locked-message,
-#notification-dialog .post-taken-over {
+#post-lock-dialog .post-locked-message,
+#post-lock-dialog .post-taken-over {
 	margin: 25px;
 }
 
-#notification-dialog .post-locked-message a.button {
+#post-lock-dialog .post-locked-message a.button {
 	margin-right: 10px;
 }
 
-#notification-dialog .post-locked-avatar {
+#post-lock-dialog .post-locked-avatar {
 	float: left;
 	margin: 0 20px 20px 0;
 }
 
-#notification-dialog .wp-tab-first {
+#post-lock-dialog .wp-tab-first {
 	outline: 0;
 }
 
-#notification-dialog .locked-saving img {
+#post-lock-dialog .locked-saving img {
 	float: left;
 	margin-right: 3px;
 }
 
-#notification-dialog-wrap.saving .locked-saving,
-#notification-dialog-wrap.saved .locked-saved {
+#post-lock-dialog.saving .locked-saving,
+#post-lock-dialog.saved .locked-saved {
 	display: inline;
 }
 
diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index aec34d982f..21d8c1e8fe 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -1202,12 +1202,12 @@ function _admin_notice_post_locked() {
 		$locked = false;
 	}
 
-	$class = $locked ? '' : ' class="hidden"';
+	$hidden = $locked ? '' : ' hidden';
 
 	?>
-	<div id="notification-dialog-wrap"<?php echo $class; ?>>
-	<div id="notification-dialog-background"></div>
-	<div id="notification-dialog">
+	<div id="post-lock-dialog" class="notification-dialog-wrap<?php echo $hidden; ?>">
+	<div class="notification-dialog-background"></div>
+	<div class="notification-dialog">
 	<?php
 
 	if ( $locked ) {
diff --git a/wp-admin/js/post.js b/wp-admin/js/post.js
index 68a702467b..160b8c73fa 100644
--- a/wp-admin/js/post.js
+++ b/wp-admin/js/post.js
@@ -256,7 +256,7 @@ $(document).on( 'heartbeat-send.refresh-lock', function( e, data ) {
 		post_id = $('#post_ID').val(),
 		send = {};
 
-	if ( !post_id )
+	if ( ! post_id || ! $('#post-lock-dialog').length )
 		return;
 
 	send['post_id'] = post_id;
@@ -276,7 +276,7 @@ $(document).on( 'heartbeat-tick.refresh-lock', function( e, data ) {
 
 		if ( received.lock_error ) {
 			// show "editing taken over" message
-			wrap = $('#notification-dialog-wrap');
+			wrap = $('#post-lock-dialog');
 
 			if ( wrap.length && ! wrap.is(':visible') ) {
 				if ( typeof autosave == 'function' ) {
@@ -305,13 +305,6 @@ $(document).on( 'heartbeat-tick.refresh-lock', function( e, data ) {
 		} else if ( received.new_lock ) {
 			$('#active_post_lock').val( received.new_lock );
 		}
-
-		if ( received.update_nonces ) {
-			$.each( received.update_nonces, function( selector, value ) {
-				if ( selector.match(/^replace-/) )
-					$( '#' + selector.replace('replace-', '') ).val( value );
-			});
-		}
 	}
 });
 
@@ -359,7 +352,7 @@ jQuery(document).ready( function($) {
 	postboxes.add_postbox_toggles(pagenow);
 
 	// Post locks: contain focus inside the dialog. If the dialog is shown, focus the first item.
-	$('#notification-dialog').on( 'keydown', function(e) {
+	$('#post-lock-dialog .notification-dialog').on( 'keydown', function(e) {
 		if ( e.which != 9 )
 			return;
 
diff --git a/wp-admin/post.php b/wp-admin/post.php
index ba482e0b16..01d4610009 100644
--- a/wp-admin/post.php
+++ b/wp-admin/post.php
@@ -176,7 +176,16 @@ case 'edit':
 			wp_enqueue_script('autosave');
 	}
 
-	add_action( 'admin_footer', '_admin_notice_post_locked' );
+	if ( is_multisite() ) {
+		add_action( 'admin_footer', '_admin_notice_post_locked' );
+	} else {
+		$check_users = get_users( array( 'fields' => 'ID', 'number' => 2 ) );
+
+		if ( count( $check_users ) > 1 )
+			add_action( 'admin_footer', '_admin_notice_post_locked' );
+
+		unset( $check_users );
+	}
 
 	$title = $post_type_object->labels->edit_item;
 	$post = get_post($post_id, OBJECT, 'edit');