FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows 2003 or Windows Vista

A DESCRIPTION OF THE PROBLEM :

When you use Metal Look&Feel, there is a small blue vertical line between the label and the checkbox with the focus.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Design a JPanel with several JCheckBoxes in a vertical group with NetBeans 5.5. Use JDK 6.0 and System Look&Feel.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The Checkboxes should be aligned properly.
ACTUAL -
Some Checkboxes are not aligned correctly.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;

public class CheckmarkPanel extends javax.swing.JPanel {
  public static void main(String[] args) throws Exception {
    UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
    JFrame frame = new JFrame();
    frame.add(new CheckmarkPanel());
    frame.pack();
    frame.setVisible(true);
  }
  
  /** Creates new form CheckmarkPanel */
  public CheckmarkPanel() {
    initComponents();
  }
  
  /** This method is called from within the constructor to
   * initialize the form.
   * WARNING: Do NOT modify this code. The content of this method is
   * always regenerated by the Form Editor.
   */
  // <editor-fold defaultstate="collapsed" desc=" Generated Code ">
  private void initComponents() {
    jCheckBox1 = new javax.swing.JCheckBox();
    jCheckBox2 = new javax.swing.JCheckBox();
    jCheckBox3 = new javax.swing.JCheckBox();
    jCheckBox4 = new javax.swing.JCheckBox();
    jCheckBox5 = new javax.swing.JCheckBox();

    jCheckBox1.setText("Fertigung:");
    jCheckBox1.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
    jCheckBox1.setHorizontalTextPosition(javax.swing.SwingConstants.LEADING);
    jCheckBox1.setMargin(new java.awt.Insets(0, 0, 0, 0));

    jCheckBox2.setText("Einkauf:");
    jCheckBox2.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
    jCheckBox2.setHorizontalTextPosition(javax.swing.SwingConstants.LEADING);
    jCheckBox2.setMargin(new java.awt.Insets(0, 0, 0, 0));

    jCheckBox3.setText("Verkauf:");
    jCheckBox3.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
    jCheckBox3.setHorizontalTextPosition(javax.swing.SwingConstants.LEADING);
    jCheckBox3.setMargin(new java.awt.Insets(0, 0, 0, 0));

    jCheckBox4.setText("Ersatzteil:");
    jCheckBox4.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
    jCheckBox4.setHorizontalTextPosition(javax.swing.SwingConstants.LEADING);
    jCheckBox4.setMargin(new java.awt.Insets(0, 0, 0, 0));

    jCheckBox5.setText("Packmittel:");
    jCheckBox5.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
    jCheckBox5.setHorizontalTextPosition(javax.swing.SwingConstants.LEADING);
    jCheckBox5.setMargin(new java.awt.Insets(0, 0, 0, 0));

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
    this.setLayout(layout);
    layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addGap(97, 97, 97)
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
          .addComponent(jCheckBox5)
          .addComponent(jCheckBox2)
          .addComponent(jCheckBox1)
          .addComponent(jCheckBox3)
          .addComponent(jCheckBox4))
        .addContainerGap(234, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addContainerGap()
        .addComponent(jCheckBox1)
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
        .addComponent(jCheckBox2)
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
        .addComponent(jCheckBox3)
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
        .addComponent(jCheckBox4)
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
        .addComponent(jCheckBox5)
        .addContainerGap(190, Short.MAX_VALUE))
    );
  }// </editor-fold>
  
  
  // Variables declaration - do not modify
  private javax.swing.JCheckBox jCheckBox1;
  private javax.swing.JCheckBox jCheckBox2;
  private javax.swing.JCheckBox jCheckBox3;
  private javax.swing.JCheckBox jCheckBox4;
  private javax.swing.JCheckBox jCheckBox5;
  // End of variables declaration
  
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Do not use System Look&Feel or do not use LEADING Checkbox labels.