Nope, same result.
In case it will help, here’s the code for UI.java:
//---------------------------------------------
// UI
//---------------------------------------------
// Last modified: May 4 2006
//
// This class defines the user interface
//---------------------------------------------
package lupine;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import javax.swing.*;
import javax.swing.text.html.*;
import java.lang.Math.*;
import java.beans.*;
import java.text.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
public class UI {
	private static Scene scene = Scene.getInstance();
	private static Render render = Render.getInstance();
	
	private static int htmlSize;
	//The format of prices in the program
	private static final DecimalFormat currencyFormat = new DecimalFormat("###,###,###,###.00");
	
	public static JPanel frame = new JPanel();
	public static Checkbox walk, fly;
	public static ImageButton keyA, keyZ, title;
	public static JEditorPane htmlPane;
	
	//Specify the html escape and regex code for the currency symbol (in this case the euro)
	public static final String currencyHtml = "€";
	public static final String currencyJava = "\u20AC";
	
	//Hardcoded html strings
	public static final String loadScreen = "<html><head><style><!-- body { margin-top: 0px; background: #FFFFFF; } " +
		"h1 { color: black; font-family: Arial, Helvetica; font-size: 20pt; }--></style></head><body>" +
		"
<table width='100%'><tr><td align='center'>" +
		"<h1>De maquette wordt geladen.
Een ogenblik geduld a.u.b.</h1></td></tr></table></body></html>";
	public static final String priceString = "Totale prijs tot nu toe: ";
	public static final String titleStart = "<table width=\"100%\" cellspacing=\"0\" cellpadding=\"0\"><tr><td><h1>";
	public static final String titleEnd = "</h1></td><td align=\"right\" valign=\"top\"><a href=\"../blank.html\">" +
		"<img src=\"../close.gif\" border=\"0\"></a></td></tr></table>";
	
	public static synchronized JPanel getPanel() {
		//Load the user interface
		loadGUI();
		
		//Pack the JPanel
		frame.validate();
		//Maximize the html panel
		UI.showHtml(2);
		
		return frame;
	}
	
	//Return the state of the html pane
	//0 = hidden, 1 = normal, 2 = maximized
	public static synchronized int getHtmlSize() {
		return htmlSize;
	}
	
	//Set the state of the html pane
	public static synchronized void setHtmlSize(int size) {
		htmlSize = size;
	}
	
	//Place GUI compments like menus and buttons on the supplied frame
	private static void loadGUI() {
		final Color background = new Color(255, 255, 255);
		URL imgURL;
		
		//Show tooltips after 10 ms instead of the default 750 ms
		ToolTipManager.sharedInstance().setInitialDelay(10);
		
		//Set the frame colors
		frame.setBackground(background);
		frame.setForeground(new java.awt.Color(0, 0, 0));
		
		//Use a gridbag layoutmanager
		frame.setLayout(new GridBagLayout());
		GridBagConstraints c = new GridBagConstraints();
		//Let components completely fill the cells
		c.fill = GridBagConstraints.BOTH;
		//Title panel
		c.gridx = 0;
		c.gridy = 0;
		c.gridwidth = 2;
		c.weightx = 0.0;
		c.weighty = 0.0;
		c.insets = new Insets(15, 50, 0, 50);
		Panel titlePanel = new Panel();
		frame.add(titlePanel, c);
		
		//Add content to title panel
			//Again, use a gridbag layoutmanager
			titlePanel.setLayout(new GridBagLayout());
			GridBagConstraints ct = new GridBagConstraints();
			ct.anchor = GridBagConstraints.NORTHWEST;
			
			ct.gridx = 0;
			ct.gridy = 0;
			imgURL = UI.class.getResource(Lupine.uiFilePath + "buttonhelp.gif");
			ImageButton buttonHelp = new ImageButton(imgURL, imgURL, 0, Lupine.htmlFilePath + "help.html");
			buttonHelp.setCursor(new Cursor(Cursor.HAND_CURSOR));
			buttonHelp.setToolTipText("Help");
			titlePanel.add(buttonHelp, ct);
			ct.gridx = 1;
			titlePanel.add(new Label(" "), ct);
			
			ct.gridx = 2;
			imgURL = UI.class.getResource(Lupine.uiFilePath + "buttoninfo.gif");
			ImageButton buttonInfo = new ImageButton(imgURL, imgURL, 0, Lupine.htmlFilePath + "info.html");
			buttonInfo.setCursor(new Cursor(Cursor.HAND_CURSOR));
			buttonInfo.setToolTipText("Info");
			titlePanel.add(buttonInfo, ct);
			
			ct.gridx = 3;
			titlePanel.add(new Label(" "), ct);
			
			ct.gridx = 4;
			imgURL = UI.class.getResource(Lupine.uiFilePath + "buttonadvanced.gif");
			ImageButton buttonAdvanced = new ImageButton(imgURL, imgURL, 0, Lupine.htmlFilePath + "options.html");
			buttonAdvanced.setCursor(new Cursor(Cursor.HAND_CURSOR));
			buttonAdvanced.setToolTipText("Geavanceerde opties");
			titlePanel.add(buttonAdvanced, ct);
			
			ct.gridx = 5;
			ct.weightx = 1.0;
			titlePanel.add(new Label(" "), ct);
			
			ct.gridx = 6;
			ct.weightx = 0.0;
			ct.gridheight = 2;
			ct.anchor = GridBagConstraints.EAST;
			imgURL = UI.class.getResource(Lupine.uiFilePath + "title.gif");
			title = new ImageButton(imgURL, imgURL, 0, "");
			titlePanel.add(title, ct);
			
			ct.gridx = 0;
			ct.gridy = 1;
			ct.gridheight = 1;
			ct.gridwidth = 5;
			ct.anchor = GridBagConstraints.WEST;
			imgURL = UI.class.getResource(Lupine.uiFilePath + "bbvh.gif");
			ImageButton logo = new ImageButton(imgURL, imgURL, 0, "");
			titlePanel.add(logo, ct);
		//
		
		//OpenGL Canvas
		c.gridy = 1;
		c.gridwidth = 1;
		c.weightx = 1.0;
		c.weighty = 1.0;
		c.insets = new Insets(5, 50, 0, 0);
		frame.add(Lupine.canvas, c);
		
		//HTML Pane
		c.gridx = 1;
		c.weightx = 0.0;
		c.weighty = 1.0;
		c.insets = new Insets(5, 0, 0, 50);
		c.anchor = GridBagConstraints.NORTHWEST;
		htmlPane = new JEditorPane("text/html", "");
		//Set the loading html page directly since loading it with setPage takes too long on old computers,
		//which prevents it from getting displayed at all
		UI.htmlPane.setText(loadScreen);
		
		htmlPane.setBackground(background);
		htmlPane.setBorder(BorderFactory.createEmptyBorder());
		htmlPane.setEditable(false);
		htmlPane.addHyperlinkListener(new MyHyperlinkListener());
		
		//Html pages are loaded asynchronously. This code fires whenever a page is fully loaded
		htmlPane.addPropertyChangeListener(new PropertyChangeListener() {
			public void propertyChange(PropertyChangeEvent e) {
				if(e.getPropertyName().equals("page")) {
					//Apply post-processing to the page
					processHtml();
				}
			}
		});
		
		
		frame.add(htmlPane, c);
		
		//Flight panel
		c.gridx = 0;
		c.gridy = 2;
		c.gridwidth = 2;
		c.weightx = 0.0;
		c.weighty = 0.0;
		c.insets = new Insets(25, 50, 25, 50);
		c.anchor = GridBagConstraints.CENTER;
		Panel flightPanel = new Panel();
		frame.add(flightPanel, c);
		
		//Add content to flightpanel
...Snipped...
		//
	}
	
	//Display a html page in the html pane
	public static boolean loadHtml(String target) {
		URL location = UI.class.getResource("/" + target);
		
		//Determine if the frame should be hidden
		if (target.equals("")) {
			//Hide the html pane
			showHtml(0);
			location = UI.class.getResource("/" + Lupine.htmlFilePath + "blank.html");
		} else {
			//Show the html pane at regular size
			showHtml(1);
		}
		//Try to display the page
		try{
			htmlPane.setPage(location);
		} catch(Exception eu){
			htmlPane.setText("Could not load page");
			//Loading the page failed
			return false;
		}
		
		//Loading the page succeeded
		return true;
	}
	
	//Show or hide the HTML component
	public static void showHtml(int size) {
		int height = (int)Math.max(Lupine.canvas.getHeight(), UI.htmlPane.getSize().getHeight());
		int fullWidth = (int)UI.frame.getSize().getWidth() - 100;
		
		//Record which state the html pane is in
		setHtmlSize(size);
		
		//Hide it
		if (size == 0) {
			//Resize the viewport to the full screen width
			Lupine.canvas.setSize(new Dimension(fullWidth, height));
			UI.htmlPane.setPreferredSize(new Dimension(0, height));
		}
		//Show it at regular size
		if (size == 1) {
			//Resize the viewport to the full screen width
			Lupine.canvas.setSize(new Dimension(fullWidth - (int)UI.title.getSize().getWidth() - 10, height));
			UI.htmlPane.setPreferredSize(new Dimension((int)UI.title.getSize().getWidth() + 10, height));
		}
		//Show it maximized
		if (size == 2) {
			//Resize the viewport to the full screen width
			Lupine.canvas.setSize(new Dimension(0, height));
			UI.htmlPane.setPreferredSize(new Dimension(fullWidth, height));
		}
		
		//Pack the JPanel
		UI.frame.validate();
		//Set the focus to the canvas so there's no selection box around the first radio button
		Lupine.canvas.requestFocusInWindow();
		
		render.setWantRender(true);
	}
}