Index: wp-admin/includes/ajax-actions.php
===================================================================
--- wp-admin/includes/ajax-actions.php	(revision 24117)
+++ wp-admin/includes/ajax-actions.php	(working copy)
@@ -1023,10 +1023,14 @@
 
 	$role = current( $user_object->roles );
 
+	ob_start();
+	$wp_list_table->single_row( $user_object, '', $role );
+	$user_row = ob_get_clean();
+
 	$x = new WP_Ajax_Response( array(
 		'what' => 'user',
 		'id' => $user_id,
-		'data' => $wp_list_table->single_row( $user_object, '', $role ),
+		'data' => $user_row,
 		'supplemental' => array(
 			'show-link' => sprintf(__( 'User <a href="#%s">%s</a> added' ), "user-$user_id", $user_object->user_login),
 			'role' => $role,
@@ -1415,7 +1419,7 @@
 		$parent = $parent_tag->parent;
 		$level++;
 	}
-	echo $wp_list_table->single_row( $tag, $level );
+	$wp_list_table->single_row( $tag, $level );
 	wp_die();
 }
 
Index: wp-admin/includes/class-wp-comments-list-table.php
===================================================================
--- wp-admin/includes/class-wp-comments-list-table.php	(revision 24117)
+++ wp-admin/includes/class-wp-comments-list-table.php	(working copy)
@@ -315,7 +315,7 @@
 		$this->user_can = current_user_can( 'edit_comment', $comment->comment_ID );
 
 		echo "<tr id='comment-$comment->comment_ID' class='$the_comment_class'>";
-		echo $this->single_row_columns( $comment );
+		$this->single_row_columns( $comment );
 		echo "</tr>\n";
 	}
 
Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php	(revision 24117)
+++ wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -826,7 +826,7 @@
 		$row_class = ( $row_class == '' ? ' class="alternate"' : '' );
 
 		echo '<tr' . $row_class . '>';
-		echo $this->single_row_columns( $item );
+		$this->single_row_columns( $item );
 		echo '</tr>';
 	}
 
Index: wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- wp-admin/includes/class-wp-posts-list-table.php	(revision 24117)
+++ wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -382,8 +382,10 @@
 			if ( $count >= $end )
 				break;
 
-			if ( $count >= $start )
-				echo "\t" . $this->single_row( $page, $level );
+			if ( $count >= $start ) {
+				echo "\t";
+				$this->single_row( $page, $level );
+			}
 
 			$count++;
 
@@ -397,8 +399,12 @@
 				foreach ( $orphans as $op ) {
 					if ( $count >= $end )
 						break;
-					if ( $count >= $start )
-						echo "\t" . $this->single_row( $op, 0 );
+
+					if ( $count >= $start ) {
+						echo "\t";
+						$this->single_row( $op, 0 );
+					}
+
 					$count++;
 				}
 			}
@@ -444,13 +450,16 @@
 				}
 				$num_parents = count( $my_parents );
 				while ( $my_parent = array_pop( $my_parents ) ) {
-					echo "\t" . $this->single_row( $my_parent, $level - $num_parents );
+					echo "\t";
+					$this->single_row( $my_parent, $level - $num_parents );
 					$num_parents--;
 				}
 			}
 
-			if ( $count >= $start )
-				echo "\t" . $this->single_row( $page, $level );
+			if ( $count >= $start ) {
+				echo "\t";
+				$this->single_row( $page, $level );
+			}
 
 			$count++;
 
Index: wp-admin/includes/class-wp-terms-list-table.php
===================================================================
--- wp-admin/includes/class-wp-terms-list-table.php	(revision 24117)
+++ wp-admin/includes/class-wp-terms-list-table.php	(working copy)
@@ -156,7 +156,7 @@
 		} else {
 			$terms = get_terms( $taxonomy, $args );
 			foreach ( $terms as $term )
-				$out .= $this->single_row( $term, 0, $taxonomy );
+				$this->single_row( $term, 0, $taxonomy );
 			$count = $number; // Only displaying a single page.
 		}
 
@@ -199,13 +199,16 @@
 
 				$num_parents = count( $my_parents );
 				while ( $my_parent = array_pop( $my_parents ) ) {
-					$output .=  "\t" . $this->single_row( $my_parent, $level - $num_parents, $taxonomy );
+					$output .=  "\t";
+					$this->single_row( $my_parent, $level - $num_parents, $taxonomy );
 					$num_parents--;
 				}
 			}
 
-			if ( $count >= $start )
-				$output .= "\t" . $this->single_row( $term, $level, $taxonomy );
+			if ( $count >= $start ) {
+				$output .= "\t";
+				$this->single_row( $term, $level, $taxonomy );
+			}
 
 			++$count;
 
@@ -225,7 +228,7 @@
 		$this->level = $level;
 
 		echo '<tr id="tag-' . $tag->term_id . '"' . $row_class . '>';
-		echo $this->single_row_columns( $tag );
+		$this->single_row_columns( $tag );
 		echo '</tr>';
 	}
 
Index: wp-admin/includes/class-wp-users-list-table.php
===================================================================
--- wp-admin/includes/class-wp-users-list-table.php	(revision 24117)
+++ wp-admin/includes/class-wp-users-list-table.php	(working copy)
@@ -209,7 +209,8 @@
 				continue;
 
 			$style = ( ' class="alternate"' == $style ) ? '' : ' class="alternate"';
-			echo "\n\t", $this->single_row( $user_object, $style, $role, isset( $post_counts ) ? $post_counts[ $userid ] : 0 );
+			echo "\n\t";
+			$this->single_row( $user_object, $style, $role, isset( $post_counts ) ? $post_counts[ $userid ] : 0 );
 		}
 	}
 
Index: wp-admin/includes/theme-install.php
===================================================================
--- wp-admin/includes/theme-install.php	(revision 24117)
+++ wp-admin/includes/theme-install.php	(working copy)
@@ -153,7 +153,7 @@
 function display_theme( $theme ) {
 	_deprecated_function( __FUNCTION__, '3.4' );
 	global $wp_list_table;
-	return $wp_list_table->single_row( $theme );
+	$wp_list_table->single_row( $theme );
 }
 
 /**