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){}      
    }
}

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(); } }); } }

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