Inconsistent performance applying ForegroundActions in a JEditorPane when reading HTML

I'm building an HTML editor using JEditorPane, but I'm getting some inconsistent performance issues with Foreground Actions. I have a simplified version of my editor below that has three actions: change the font color to red or blue, or change the font-size. Now using the following testFile.html file:

<html>
  <head><title>Title</title></head>
  <body link="#0000FF" bgcolor="white">
    <font size="4" face="arial" color="black">Some test text</font>
    <font size="3" face="arial" color="black">Some new test text </font>
  </body>
</html>

sometimes I can highlight some text in the editor, and press the red or blue color buttons, and it works fine i.e. it changes color. On other occasions (i.e. if I close my JVM and start it up again) the color will not change UNTIL I apply a StyledEditorKit.FontSizeAction on the same text.

Is there something missing in how I'm applying the ForegroundActions? Or might this be some Java bug?

Code below:

public class EditorTest extends JFrame{

private JEditorPane editorPane;
    public EditorTest() 
    {
    editorPane = new JEditorPane();     
    editorPane.setContentType("text/HTML");        
    getContentPane().add(editorPane, BorderLayout.CENTER);
    editorPane.setEditorKit(new HTMLEditorKit());


    Action a = new StyledEditorKit.ForegroundAction("RedColor", Color.RED);        
    editorPane.getActionMap().put("RedColor", a);

    JToolBar bar = new JToolBar();

    JButton button = new JButton("blue");
    button.addActionListener(new StyledEditorKit.ForegroundAction (
                        "set-foreground-red", Color.blue));


    bar.add(editorPane.getActionMap().get("font-size-12")).setText("12");
    bar.add(button);
    bar.add(editorPane.getActionMap().get("RedColor")).setText("Red");

    getContentPane().add(bar, BorderLayout.NORTH);
    setSize(650,600);
    setVisible(true);

    File file = new File("testFile.html");
    FileReader reader = null;
    try
    {
        reader = new FileReader(file);
        editorPane.read(reader, null);
    }
    catch (IOException ex){}      
    }
}

Using the sscce below, I am unable to reproduce the effect you describe. Such anomalies may arise if Swing GUI objects are not constructed and manipulated only on the event dispatch thread. The example uses EventQueue.invokeLater() accordingly.

StyledEditorTest

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JToolBar;
import javax.swing.text.StyledEditorKit;
import javax.swing.text.html.HTMLEditorKit;

/** http://stackoverflow.com/questions/8523445 */
public class StyledEditorTest extends JFrame {

    public StyledEditorTest() {
        JEditorPane editorPane = new JEditorPane();
        editorPane.setContentType("text/HTML");
        editorPane.setEditorKit(new HTMLEditorKit());
        editorPane.setText("<hr>Welcome to <b>StackOverFlow!</b><hr>");
        JToolBar bar = new JToolBar();
        bar.add(new StyledEditorKit.ForegroundAction("Red", Color.red));
        bar.add(new StyledEditorKit.ForegroundAction("Blue", Color.blue));
        bar.add(new StyledEditorKit.FontSizeAction("12", 12));
        bar.add(new StyledEditorKit.FontSizeAction("14", 14));
        bar.add(new StyledEditorKit.FontSizeAction("16", 16));
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setLocationRelativeTo(null);
        this.add(bar, BorderLayout.NORTH);
        this.add(editorPane, BorderLayout.CENTER);
        this.pack();
        this.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new StyledEditorTest();
            }
        });
    }
}

Inconsistent performance applying ForegroundActions in a JEditorPane when reading HTML

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