Mavericks changed my background color without warning?

I set the background on my desktops (external thunderbolt monitor) to solid black and I can't remember if I clicked the back button first, but I then closed out of system preferences...
I used the machine for several hours, then shut it down. I came back today and the backgrounds are both white...
Anyone else having this happen? What could have possibly caused this? I shut the computer down (it did not crash, or exhibit the infamous Mavericks random shutdown bug), so I'm having trouble figuring out the best way to diagnose this.
Please help!

Check the default color settings:
*Tools > Options > Content : Fonts & Colors > Colors
* [X] "Allow pages to choose their own colors, instead of my selections above"
*https://support.mozilla.com/kb/Changing+fonts+and+colors

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Hi,
I create object loading program. my problem is run time i change object background color using color picker. i select any one color of color picker than submit. The selecting color not assign object background.
pls help me? How to run time change object background color?
here follwing code
import com.sun.j3d.loaders.objectfile.ObjectFile;
import com.sun.j3d.loaders.ParsingErrorException;
import com.sun.j3d.loaders.IncorrectFormatException;
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import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.io.*;
import com.sun.j3d.utils.behaviors.vp.*;
import java.net.URL;
import java.net.MalformedURLException;
import java.awt.Graphics ;
import javax.swing.*;
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private boolean spin = false;
private boolean noTriangulate = false;
private boolean noStripify = false;
private double creaseAngle = 60.0;
private URL filename = null;
private SimpleUniverse u;
private BoundingSphere bounds;
private Panel cardPanel;
private Button Tit,sub;
private CardLayout ourLayout;
private BorderLayout bl;
Background bgNode;
BranchGroup objRoot;
List thelist;
Label l1;
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if (!noStripify) flags |= ObjectFile.STRIPIFY;
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bgNode.setApplicationBounds(bounds);
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System.out.println("-t No stripification");
System.out.println("-c Set crease angle for normal generation (default is 60 without");
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viewingPlatform.setNominalViewingTransform();
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viewingPlatform.setViewPlatformBehavior(orbit);
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                    if (args.startsWith("-")) {
                         if (args[i].equals("-s")) {
                              spin = true;
                         } else if (args[i].equals("-n")) {
                              noTriangulate = true;
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                              noStripify = true;
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                              if (i < args.length - 1) {
                                   creaseAngle = (new Double(args[++i])).doubleValue();
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                              usage();
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                         try {
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                                        (args[i].indexOf("http") == 0)) {
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hi,
i am using setColor(Color3f color) method
like
if (e.getSource() == Tit)
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     bgNode.setApplicationBounds(bounds);
     objRoot.addChild(bgNode);
but error will be displayed
like
javax.media.j3d.CapabilityNotSetException: Background: no capability to set color
     at javax.media.j3d.Background.setColor(Background.java:307)
     at ObjLoad1.actionPerformed(ObjLoad1.java:230)
     at java.awt.Button.processActionEvent(Unknown Source)
     at java.awt.Button.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
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