diff --git a/Classes/PHPExcel/Autoloader.php b/Classes/PHPExcel/Autoloader.php
index 3a51ea43..51336c27 100644
--- a/Classes/PHPExcel/Autoloader.php
+++ b/Classes/PHPExcel/Autoloader.php
@@ -31,6 +31,7 @@ PHPExcel_Shared_ZipStreamWrapper::register();
 if (ini_get('mbstring.func_overload') & 2) {
 	throw new Exception('Multibyte function overloading in PHP must be disabled for string functions (2).');
 }
+PHPExcel_Shared_String::buildCharacterSets();
 
 
 class PHPExcel_Autoloader
diff --git a/Classes/PHPExcel/Reader/CSV.php b/Classes/PHPExcel/Reader/CSV.php
index 6c794628..717a6856 100644
--- a/Classes/PHPExcel/Reader/CSV.php
+++ b/Classes/PHPExcel/Reader/CSV.php
@@ -230,20 +230,22 @@ class PHPExcel_Reader_CSV implements PHPExcel_Reader_IReader
 				break;
 		}
 
+		$escapeEnclosures = array( "\\" . $this->_enclosure,
+								   $this->_enclosure . $this->_enclosure
+								 );
+
 		// Loop through file
 		$currentRow = $contiguousRow = 0;
 		$rowData = array();
 		while (($rowData = fgetcsv($fileHandle, 0, $this->_delimiter, $this->_enclosure)) !== FALSE) {
 			++$currentRow;
 			$crset = false;
-			$ccRef = 0;
 			$rowDataCount = count($rowData);
+			$columnLetter = 'A';
 			for ($i = 0; $i < $rowDataCount; ++$i) {
-				$columnLetter = PHPExcel_Cell::stringFromColumnIndex($i);
 				if ($rowData[$i] != '' && $this->_readFilter->readCell($columnLetter, $currentRow)) {
 					// Unescape enclosures
-					$rowData[$i] = str_replace("\\" . $this->_enclosure, $this->_enclosure, $rowData[$i]);
-					$rowData[$i] = str_replace($this->_enclosure . $this->_enclosure, $this->_enclosure, $rowData[$i]);
+					$rowData[$i] = str_replace($escapeEnclosures, $this->_enclosure, $rowData[$i]);
 
 					// Convert encoding if necessary
 					if ($this->_inputEncoding !== 'UTF-8') {
@@ -256,12 +258,13 @@ class PHPExcel_Reader_CSV implements PHPExcel_Reader_IReader
 							$crset = true;
 						}
 						// Set cell value
-						$objPHPExcel->getActiveSheet()->getCell(PHPExcel_Cell::stringFromColumnIndex($ccRef++) . $contiguousRow)->setValue($rowData[$i]);
+						$objPHPExcel->getActiveSheet()->getCell($columnLetter . $contiguousRow)->setValue($rowData[$i]);
 					} else {
 						// Set cell value
 						$objPHPExcel->getActiveSheet()->getCell($columnLetter . $currentRow)->setValue($rowData[$i]);
 					}
 				}
+				++$columnLetter;
 			}
 		}
 
diff --git a/Classes/PHPExcel/Reader/Excel2007.php b/Classes/PHPExcel/Reader/Excel2007.php
index 315a34f3..7a5c2fdf 100644
--- a/Classes/PHPExcel/Reader/Excel2007.php
+++ b/Classes/PHPExcel/Reader/Excel2007.php
@@ -194,11 +194,11 @@ class PHPExcel_Reader_Excel2007 implements PHPExcel_Reader_IReader
 //		echo 'Initial Cast to Boolean<br />';
 		$value = isset($c->v) ? (string) $c->v : null;
 		if ($value == '0') {
-			$value = false;
+			return false;
 		} elseif ($value == '1') {
-			$value = true;
+			return true;
 		} else {
-			$value = (bool)$c->v;
+			return (bool)$c->v;
 		}
 		return $value;
 	}	//	function _castToBool()
diff --git a/Classes/PHPExcel/Shared/String.php b/Classes/PHPExcel/Shared/String.php
index 784c313e..dabb2451 100644
--- a/Classes/PHPExcel/Shared/String.php
+++ b/Classes/PHPExcel/Shared/String.php
@@ -322,6 +322,15 @@ class PHPExcel_Shared_String
 		return true;
 	}
 
+	public static function buildCharacterSets() {
+		if(empty(self::$_controlCharacters)) {
+			self::_buildControlCharacters();
+		}
+		if(empty(self::$_SYLKCharacters)) {
+			self::_buildSYLKCharacters();
+		}
+	}
+
 	/**
 	 * Convert from OpenXML escaped control character to PHP control character
 	 *
@@ -337,10 +346,6 @@ class PHPExcel_Shared_String
 	 * @return 	string
 	 */
 	public static function ControlCharacterOOXML2PHP($value = '') {
-		if(empty(self::$_controlCharacters)) {
-			self::_buildControlCharacters();
-		}
-
 		return str_replace( array_keys(self::$_controlCharacters), array_values(self::$_controlCharacters), $value );
 	}
 
@@ -359,10 +364,6 @@ class PHPExcel_Shared_String
 	 * @return 	string
 	 */
 	public static function ControlCharacterPHP2OOXML($value = '') {
-		if(empty(self::$_controlCharacters)) {
-			self::_buildControlCharacters();
-		}
-
 		return str_replace( array_values(self::$_controlCharacters), array_keys(self::$_controlCharacters), $value );
 	}
 
@@ -657,10 +658,6 @@ class PHPExcel_Shared_String
 			return $pValue;
 		}
 
-		if(empty(self::$_SYLKCharacters)) {
-			self::_buildSYLKCharacters();
-		}
-
 		foreach (self::$_SYLKCharacters as $k => $v) {
 			$pValue = str_replace($k, $v, $pValue);
 		}