JPanel is "Tearing" / Jerky

I used a CardLayout to put two JPanels on top of another for my application.
The first jpanel is of my game, which runs perfectly fine without slowdowns.
On the title screen, however, I am noticing some tearing and I can't for the life of me figure out why.
The code (as far as I can see) is pretty much almost the same as the game's in terms of structure.
The moving "FakeBlocks" tear occasionally and the animation is jerky (unlike in the game -- which works perfectly).

Does it look like I'm missing an override, or as if I'm skipping / calling the wrong thing?
I've been looking at this code for a few hours now.

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.geom.*;
import java.util.ArrayList;
import java.util.*;
import java.io.*;


public class LevelSelect extends JPanel implements MouseMotionListener,MouseListener {
   public static Image bufferImage;
   public Image background = Toolkit.getDefaultToolkit().getImage("images/misc/background1.png");
   public Game GamePanel = new Game();
   public int ctr;
   private ArrayList a = new ArrayList();
   Random rnd = new Random();
   FontMetrics fm;
   Font cookies;
   AnimUpdate update;
   public LevelSelect() {
      setDoubleBuffered(false);
      setIgnoreRepaint(true);
      rnd.setSeed(System.currentTimeMillis());
      setLayout(new GridLayout());
      addMouseListener(this);
      addMouseMotionListener(this);
      add(GamePanel);
      GamePanel.setSize(this.getWidth(),this.getHeight());
      GamePanel.setVisible(false);
      cookies = GameScreens.cookies.deriveFont((float)24);
      fm = getFontMetrics(cookies);
      for (int i=0; i<1; i++) {
         FakeBlock fb = new FakeBlock();
         fb.blockType=rnd.nextInt(8)+1;
         fb.speed=(rnd.nextInt(4)+2)*2;
         fb.xPos=rnd.nextInt(481);
         fb.yPos=15+i*65;//112+i*35;
         fb.setImage();
         a.add(fb);
      }
      
      update = new AnimUpdate();
      update.start();
      setVisible(true);
   }   
   
   public void paintComponent(Graphics g) {
      Graphics2D g2;
      
      // Create bufferImage & set vars if it/they don't exist
      if (bufferImage == null) {
         bufferImage = createImage(this.getWidth(),this.getHeight());         
         g2 = (Graphics2D)bufferImage.getGraphics();
         g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
      }
      
      g2 = (Graphics2D)bufferImage.getGraphics();
      g2.setFont(cookies);

      String str2 = "Click to Continue";
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
      
      g2.drawImage(GameScreens.background,0,0,null);
      AlphaComposite ac;
      ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER,(float).4);
      g2.setComposite(ac);
      for (int i=0; i<a.size(); i++) {
         FakeBlock fb = (FakeBlock)a.get(i);
         fb.move();
         g2.drawImage(fb.myPicture,fb.xPos,fb.yPos,null);
      }
      ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER,(float)1);
      g2.setComposite(ac);
      g2.drawImage(GameScreens.titleScr,0,0,null);
      
      ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER,(float)Math.abs(Math.sin(Math.toRadians(ctr%180))));
      g2.setComposite(ac);
      g2.drawString(str2,(int)((this.getWidth()-fm.stringWidth(str2))/2.0),320);
      g.drawImage(bufferImage,0,0,null);
   }
   
    public void update(Graphics g) {
       paintImmediately(0,0,480,400);
    }
   
   public void paint(Graphics g) {
      paintComponent(g);
   }
      public void mouseDragged(MouseEvent e) {
   } //end method mouseDragged
   
   //for when the mouse is just moving
   public void mouseMoved(MouseEvent e) {
   } //end of method mouseMoved
   
   //for when the mouse button is held down
   public void mousePressed(MouseEvent e) {
   } //end of method mousePressed
   
   //for when the mouse button is released
   public void mouseReleased(MouseEvent e) {
      GameScreens.goGameScreen();
   } //end of method mouseReleased
   
   //some unused mouse methods
   public void mouseClicked(MouseEvent e) {
   }
   public void mouseEntered(MouseEvent e){ }
   public void mouseExited(MouseEvent e) { }
   
   class FakeBlock {
      public int blockType;
      public AlphaComposite alpha;
      public int xPos;
      public int yPos;
      public double speed;
      public double alphaOffset;
      public double alphaSpeed;
      public Image myPicture;
      
      public FakeBlock() {
         
      }
      
      public void setImage() {

         if (blockType == 0) {
            myPicture=GameScreens.one;
         } else if(blockType ==1) {
            myPicture=GameScreens.two;
         } else if (blockType == 2) {
            myPicture=GameScreens.thr;
         } else if (blockType == 3) {
            myPicture=GameScreens.fou;
         } else if(blockType == 4) {
            myPicture=GameScreens.fiv;
         } else if (blockType == 5) {
            myPicture=GameScreens.six;
         } else if (blockType == 6) {
            myPicture=GameScreens.sev;
         } else if (blockType == 7) {
            myPicture=GameScreens.eig;
         } else if (blockType == 8) {
            myPicture=GameScreens.nin;
         }
      }
      
      public void paint(Graphics g) {
         paintComponent(g);
      }
      
      public void move() {
         xPos += (int)speed;
         if (xPos > 481) {
            blockType=rnd.nextInt(8)+1;
            speed=(rnd.nextInt(4)+2)*2;
            xPos=-32-rnd.nextInt(200);

            setImage();
         }
      }
   }
   
   class AnimUpdate extends Thread {
      //the method run when .start() is called
      public void run() {
         while(Thread.currentThread() == update) {
            //paint & update the frame number
            paintImmediately(0,0,480,400);
            ++ctr;
            try { //sleep try-catch
               Thread.sleep(16);   
            } catch(InterruptedException e) {
               System.out.println("InterruptedException @ AnimUpdate");
            } //end of try-catch block (sleep)
            
            
         } //end of while loop
      } //end of run() method
   } //end of class AnimUpdate
}

		JPanel is "Tearing" / Jerky (Read 490 times)
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