diff --git a/Classes/PHPExcel/Worksheet.php b/Classes/PHPExcel/Worksheet.php
index 64256dc..e3bcd06 100644
--- a/Classes/PHPExcel/Worksheet.php
+++ b/Classes/PHPExcel/Worksheet.php
@@ -2777,6 +2777,10 @@ class PHPExcel_Worksheet implements PHPExcel_IComparable
 				} elseif ($key == '_drawingCollection') {
 					$newCollection = clone $this->_drawingCollection;
 					$this->_drawingCollection = $newCollection;
+				} elseif (($key == '_autoFilter') && (is_a($this->_autoFilter,'PHPExcel_Worksheet_AutoFilter'))) {
+					$newAutoFilter = clone $this->_autoFilter;
+					$this->_autoFilter = $newAutoFilter;
+					$this->_autoFilter->setParent($this);
 				} else {
 					$this->{$key} = unserialize(serialize($val));
 				}
diff --git a/Classes/PHPExcel/Worksheet/AutoFilter.php b/Classes/PHPExcel/Worksheet/AutoFilter.php
index e84ff21..08f5df2 100644
--- a/Classes/PHPExcel/Worksheet/AutoFilter.php
+++ b/Classes/PHPExcel/Worksheet/AutoFilter.php
@@ -587,7 +587,7 @@ class PHPExcel_Worksheet_AutoFilter
 		list($rangeStart,$rangeEnd) = PHPExcel_Cell::rangeBoundaries($this->_range);
 
 		//	The heading row should always be visible
-		echo 'AutoFilter Heading Row ',$rangeStart[1],' is always SHOWN',PHP_EOL;
+//		echo 'AutoFilter Heading Row ',$rangeStart[1],' is always SHOWN',PHP_EOL;
 		$this->_workSheet->getRowDimension($rangeStart[1])->setVisible(TRUE);
 
 		$columnFilterTests = array();
@@ -763,17 +763,17 @@ class PHPExcel_Worksheet_AutoFilter
 			}
 		}
 
-		echo 'Column Filter Test CRITERIA',PHP_EOL;
-		var_dump($columnFilterTests);
-
+//		echo 'Column Filter Test CRITERIA',PHP_EOL;
+//		var_dump($columnFilterTests);
+//
 		//	Execute the column tests for each row in the autoFilter range to determine show/hide,
 		for ($row = $rangeStart[1]+1; $row <= $rangeEnd[1]; ++$row) {
-			echo 'Testing Row = ',$row,PHP_EOL;
+//			echo 'Testing Row = ',$row,PHP_EOL;
 			$result = TRUE;
 			foreach($columnFilterTests as $columnID => $columnFilterTest) {
-				echo 'Testing cell ',$columnID.$row,PHP_EOL;
+//				echo 'Testing cell ',$columnID.$row,PHP_EOL;
 				$cellValue = $this->_workSheet->getCell($columnID.$row)->getCalculatedValue();
-				echo 'Value is ',$cellValue,PHP_EOL;
+//				echo 'Value is ',$cellValue,PHP_EOL;
 				//	Execute the filter test
 				$result = $result &&
 					call_user_func_array(
@@ -783,13 +783,13 @@ class PHPExcel_Worksheet_AutoFilter
 							$columnFilterTest['arguments']
 						)
 					);
-				echo (($result) ? 'VALID' : 'INVALID'),PHP_EOL;
+//				echo (($result) ? 'VALID' : 'INVALID'),PHP_EOL;
 				//	If filter test has resulted in FALSE, exit the loop straightaway rather than running any more tests
 				if (!$result)
 					break;
 			}
 			//	Set show/hide for the row based on the result of the autoFilter result
-			echo (($result) ? 'SHOW' : 'HIDE'),PHP_EOL;
+//			echo (($result) ? 'SHOW' : 'HIDE'),PHP_EOL;
 			$this->_workSheet->getRowDimension($row)->setVisible($result);
 		}
 
@@ -815,7 +815,7 @@ class PHPExcel_Worksheet_AutoFilter
 				$this->$key = array();
 				foreach ($value as $k => $v) {
 					$this->$key[$k] = clone $v;
-					// attache the new cloned Column to this new cloned Autofilter object
+					// attach the new cloned Column to this new cloned Autofilter object
 					$this->$key[$k]->setParent($this);
 				}
 			} else {
diff --git a/Classes/PHPExcel/Worksheet/AutoFilter/Column.php b/Classes/PHPExcel/Worksheet/AutoFilter/Column.php
index d7b866b..d41c3ed 100644
--- a/Classes/PHPExcel/Worksheet/AutoFilter/Column.php
+++ b/Classes/PHPExcel/Worksheet/AutoFilter/Column.php
@@ -369,6 +369,8 @@ class PHPExcel_Worksheet_AutoFilter_Column
 				$this->$key = array();
 				foreach ($value as $k => $v) {
 					$this->$key[$k] = clone $v;
+					// attach the new cloned Rule to this new cloned Autofilter Cloned object
+					$this->$key[$k]->setParent($this);
 				}
 			} else {
 				$this->$key = $value;