Some problems about GIF images...

I'm not sure it would cause that sort of problem, but I believe your toBufferdImage code should be:

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public static BufferedImage toBufferedImage(Image image) {
      BufferedImage bi = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB);
      Graphics g = bi.createGraphics();
      g.drawImage(image, 0, 0, null);
      g.dispose();
      
      return bi;
   }

The main thing is that I don't think you count on getGraphics to return the same Graphics object every time. Hence, you should get the object once. I also used createGraphics instead of getGraphics because that's the more "normal" method to call for a BufferedImage.

This is the code I've been using for loading images:

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public static BufferedImage bufferImage(final Image image) {
   if(image == null)
      return null;

   //this enables transparency and makes the Image more likely to be a managed image
   BufferedImage buffer = createImage(image.getWidth(null), image.getHeight(null));
   Graphics2D g2 = buffer.createGraphics();
   g2.drawImage(image, 0, 0, null);
   g2.dispose();

   return buffer;
} //end bufferImage

public static BufferedImage createImage(final int width, final int height) {
   return createImage(width, height, true);
} //end createImage

public static BufferedImage createImage(final int width, final int height,
   final boolean bAllowTransparency)
{
   //get the GraphicsConfiguration
   GraphicsConfiguration graphicsConfiguration = GraphicsEnvironment.
      getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();

   //this enables/disables transparency and makes the Image more likely to be managed
   return graphicsConfiguration.createCompatibleImage(width, height,
      bAllowTransparency ? Transparency.BITMASK : Transparency.OPAQUE);
} //end createImage

public static BufferedImage loadImage(final InputStream inputStream) {
   //load the file
   BufferedImage image = null;
   try {
      image = ImageIO.read(inputStream);
   } catch(Exception exception) {
      if(image == null)
         return null;
   }

   return bufferImage(image);
} //end loadImage

It's a bit more complicated than it has to be because I use the buffer/create methods for creating images too.