Index: wp-admin/includes/ajax-actions.php
===================================================================
--- wp-admin/includes/ajax-actions.php	(revision 24117)
+++ wp-admin/includes/ajax-actions.php	(working copy)
@@ -1415,7 +1415,7 @@
 		$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)
@@ -136,7 +136,6 @@
 		$args['offset'] = $offset = ( $page - 1 ) * $number;
 
 		// convert it to table rows
-		$out = '';
 		$count = 0;
 
 		$terms = array();
@@ -152,11 +151,11 @@
 				$children = _get_term_hierarchy( $taxonomy );
 
 			// Some funky recursion to get the job done( Paging & parents mainly ) is contained within, Skip it for non-hierarchical taxonomies for performance sake
-			$out .= $this->_rows( $taxonomy, $terms, $children, $offset, $number, $count );
+			$this->_rows( $taxonomy, $terms, $children, $offset, $number, $count );
 		} 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.
 		}
 
@@ -165,8 +164,6 @@
 			echo '<tr class="no-items"><td class="colspanchange" colspan="' . $this->get_column_count() . '">';
 			$this->no_items();
 			echo '</td></tr>';
-		} else {
-			echo $out;
 		}
 	}
 
@@ -174,7 +171,6 @@
 
 		$end = $start + $per_page;
 
-		$output = '';
 		foreach ( $terms as $key => $term ) {
 
 			if ( $count >= $end )
@@ -199,23 +195,24 @@
 
 				$num_parents = count( $my_parents );
 				while ( $my_parent = array_pop( $my_parents ) ) {
-					$output .=  "\t" . $this->single_row( $my_parent, $level - $num_parents, $taxonomy );
+					echo "\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 ) {
+				echo "\t";
+				$this->single_row( $term, $level, $taxonomy );
+			}
 
 			++$count;
 
 			unset( $terms[$key] );
 
 			if ( isset( $children[$term->term_id] ) && empty( $_REQUEST['s'] ) )
-				$output .= $this->_rows( $taxonomy, $terms, $children, $start, $per_page, $count, $term->term_id, $level + 1 );
+				$this->_rows( $taxonomy, $terms, $children, $start, $per_page, $count, $term->term_id, $level + 1 );
 		}
-
-		return $output;
 	}
 
 	function single_row( $tag, $level = 0 ) {
@@ -225,7 +222,7 @@
 		$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-upgrader.php
===================================================================
--- wp-admin/includes/class-wp-upgrader.php	(revision 24117)
+++ wp-admin/includes/class-wp-upgrader.php	(working copy)
@@ -1129,7 +1129,7 @@
 			return;
 		$this->done_header = true;
 		echo '<div class="wrap">';
-		echo screen_icon();
+		screen_icon();
 		echo '<h2>' . $this->options['title'] . '</h2>';
 	}
 	function footer() {
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 +209,7 @@
 				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 );
 }
 
 /**