Eclipse WindowBuilder Pro black/invisible AWT Components in Design Tab

Question

I installed a new version of Eclipse Kepler (4.3.1) and WindowBuilder Pro. If I create a new SWING Window Application my AWT components are invisible or black in the Design-View.

The Program itself shows all added components if I build it. The J-Components like JButton, JLabel etc. work fine, just the AWT components are broken.

Here is the code that the WindowBuilder generated:

import java.awt.EventQueue;

import javax.swing.JFrame;
import java.awt.Button;

public class test1 {

private JFrame frame;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                test1 window = new test1();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */
public test1() {
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 450, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);

    Button button = new Button("New button");
    button.setBounds(10, 45, 117, 29);
    frame.getContentPane().add(button);

    Button button_1 = new Button("New button");
    button_1.setBounds(10, 10, 117, 29);
    frame.getContentPane().add(button_1);
}
}

The code itself works fine, it is just my view in the design-tab that is broken. Does anyone know how I can fix this?

Or maybe there is a WindowBuilder and AWT related setting that I don't know about.

My System:

1. OS X 10.9
2. Eclipse 4.3.1
3. WindowBuilder Pro (Integration Version for Kepler)

Thanks