diff --git a/build/shared/revisions.txt b/build/shared/revisions.txt
index 2dc8541ed..c5a92fc10 100644
--- a/build/shared/revisions.txt
+++ b/build/shared/revisions.txt
@@ -84,6 +84,13 @@ PROCESSING 2.0b7 (REV 0215) - 25 November 2012
 + Change output from processing-java to be UTF-8 encoded.
   http://code.google.com/p/processing/issues/detail?id=1418
 
++ Disable Quartz renderer to fix line blending problem on OS X. 
+  This older renderer was faster but had some bugs, like one that
+  caused lines to composite incorrectly when alpha was used. 
+  Add "PApplet.useQuartz = true;" into your PApplet.main() 
+  function to switch back to the old method:
+  http://processing.googlecode.com/svn/trunk/processing/build/javadoc/core/processing/core/PApplet.html#useQuartz
+
 [ bug fixes ] 
 
 + mouseButton not being set properly in mouseClicked.
diff --git a/core/src/processing/core/PApplet.java b/core/src/processing/core/PApplet.java
index 936233f90..8ab611d17 100644
--- a/core/src/processing/core/PApplet.java
+++ b/core/src/processing/core/PApplet.java
@@ -219,7 +219,7 @@ public class PApplet extends Applet
    * change this setting before you call PApplet.main().
    * <pre>
    * static public void main(String[] args) {
-   *   PApplet.useQuartz = "false";
+   *   PApplet.useQuartz = false;
    *   PApplet.main(new String[] { "YourSketch" });
    * }
    * </pre>
@@ -227,7 +227,8 @@ public class PApplet extends Applet
    * it's such a terrible hack in how it's employed here. Calling setProperty()
    * inside setup() is a joke, since it's long since the AWT has been invoked.
    */
-  static public boolean useQuartz = true;
+//  static public boolean useQuartz = true;
+  static public boolean useQuartz = false;
 
   /**
    * Whether to use native (AWT) dialogs for selectInput and selectOutput.
diff --git a/core/todo.txt b/core/todo.txt
index 77657c179..4f0d5f0db 100644
--- a/core/todo.txt
+++ b/core/todo.txt
@@ -88,6 +88,8 @@ X using com.sun.image.codec.jpeg.* in PImage causes problems with OpenJDK
 X   http://code.google.com/p/processing/issues/detail?id=1424
 X fix problem with background() and the default composite (for Casey)
 X   also store the default composite instance and use that on blendMode(BLEND)
+X disable Quartz renderer to fix line blending problem from Casey
+X   might make sketches run more slowly
 
 _ implement mousePressed(Event) etc
 _   better to do this instead of bringing back the magic event