diff --git a/CHANGELOG.TXT b/CHANGELOG.TXT
index 943614f..401c5c7 100755
--- a/CHANGELOG.TXT
+++ b/CHANGELOG.TXT
@@ -1,3 +1,7 @@
+5.9.146 (2012-02-12)
+	- Bug item #3486880 "$filehash undefine error" was fixed.
+	- The default font is now the one specified at PDF_FONT_NAME_MAIN constant.
+
 5.9.145 (2012-01-28)
 	- Japanese language file was added.
 	- TCPDF license and README.TXT files were updated.
diff --git a/README.TXT b/README.TXT
index f78081f..a22d72b 100755
--- a/README.TXT
+++ b/README.TXT
@@ -8,8 +8,8 @@ http://sourceforge.net/donate/index.php?group_id=128076
 ------------------------------------------------------------
 
 Name: TCPDF
-Version: 5.9.145
-Release date: 2012-01-28
+Version: 5.9.146
+Release date: 2012-02-12
 Author:	Nicola Asuni
 
 Copyright (c) 2002-2012:
diff --git a/tcpdf.php b/tcpdf.php
index 7ce0329..a9dabac 100755
--- a/tcpdf.php
+++ b/tcpdf.php
@@ -1,9 +1,9 @@
 <?php
 //============================================================+
 // File name   : tcpdf.php
-// Version     : 5.9.145
+// Version     : 5.9.146
 // Begin       : 2002-08-03
-// Last Update : 2012-01-28
+// Last Update : 2012-02-12
 // Author      : Nicola Asuni - Tecnick.com LTD - Manor Coach House, Church Hill, Aldershot, Hants, GU12 4RQ, UK - www.tecnick.com - info@tecnick.com
 // License     : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3
 // -------------------------------------------------------------------
@@ -137,7 +137,7 @@
  * Tools to encode your unicode fonts are on fonts/utils directory.</p>
  * @package com.tecnick.tcpdf
  * @author Nicola Asuni
- * @version 5.9.145
+ * @version 5.9.146
  */
 
 // Main configuration file. Define the K_TCPDF_EXTERNAL_CONFIG constant to skip this file.
@@ -149,7 +149,7 @@ require_once(dirname(__FILE__).'/config/tcpdf_config.php');
  * TCPDF project (http://www.tcpdf.org) has been originally derived in 2002 from the Public Domain FPDF class by Olivier Plathey (http://www.fpdf.org), but now is almost entirely rewritten.<br>
  * @package com.tecnick.tcpdf
  * @brief PHP class for generating PDF documents without requiring external extensions.
- * @version 5.9.145
+ * @version 5.9.146
  * @author Nicola Asuni - info@tecnick.com
  */
 class TCPDF {
@@ -160,7 +160,7 @@ class TCPDF {
 	 * Current TCPDF version.
 	 * @private
 	 */
-	private $tcpdf_version = '5.9.145';
+	private $tcpdf_version = '5.9.146';
 
 	// Protected properties
 
@@ -1896,7 +1896,7 @@ class TCPDF {
 		$this->gradients = array();
 		$this->InFooter = false;
 		$this->lasth = 0;
-		$this->FontFamily = 'helvetica';
+		$this->FontFamily = defined('PDF_FONT_NAME_MAIN')?PDF_FONT_NAME_MAIN:'helvetica';
 		$this->FontStyle = '';
 		$this->FontSizePt = 12;
 		$this->underline = false;
@@ -3751,7 +3751,8 @@ class TCPDF {
 		$this->y = $this->h - (1 / $this->k);
 		$this->lMargin = 0;
 		$this->_out('q');
-		$this->SetFont('helvetica', '', 1);
+		$font = defined('PDF_FONT_NAME_MAIN')?PDF_FONT_NAME_MAIN:'helvetica';
+		$this->SetFont($font, '', 1);
 		$this->setTextRenderingMode(0, false, false);
 		$msg = "\x50\x6f\x77\x65\x72\x65\x64\x20\x62\x79\x20\x54\x43\x50\x44\x46\x20\x28\x77\x77\x77\x2e\x74\x63\x70\x64\x66\x2e\x6f\x72\x67\x29";
 		$lnk = "\x68\x74\x74\x70\x3a\x2f\x2f\x77\x77\x77\x2e\x74\x63\x70\x64\x66\x2e\x6f\x72\x67";
@@ -7579,6 +7580,8 @@ class TCPDF {
 				$this->Error('[Image] Unable to get image: '.$file);
 			}
 		}
+		// file hash
+		$filehash = md5($file);
 		// get original image width and height in pixels
 		list($pixw, $pixh) = $imsize;
 		// calculate image width and height on document
@@ -7677,7 +7680,6 @@ class TCPDF {
 			}
 		} elseif (substr($file, 0, -34) != K_PATH_CACHE.'msk') {
 			// check for cached images with alpha channel
-			$filehash = md5($file);
 			$tempfile_plain = K_PATH_CACHE.'mskp_'.$filehash;
 			$tempfile_alpha = K_PATH_CACHE.'mska_'.$filehash;
 			if (in_array($tempfile_plain, $this->imagekeys)) {