STEPS TO REPRODUCE
Observe the applet above using Safari running Java 1.4.

RESULTS
The components overlap. Rarely this happens when the applet is first loaded, but it always happens within a few clicks of Safari's "Reload the current page" button.

REGRESSION
No problem on Windows (Microsoft JVM or Sun JVM 1.4.x or 1.5 beta) or Java 1.3.x in other OS X browsers.

Source code:

import java.applet.*;
import java.awt.*;

public class into_lap extends Applet {

public void init()
{
    setBackground(new Color(255, 240, 255));
    setLayout(new GridBagLayout());
    TextField tf = new TextField();
    constrain(this, tf, 0, 0, 1, 1,
        GridBagConstraints.NORTH, 0, 0, 0, 0, GridBagConstraints.NONE, 0, 0);
    Label label = new Label("Text in label");
    constrain(this, label, 1, 0, 1, 1,
        GridBagConstraints.NORTH, 0, 0, 0, 0, GridBagConstraints.NONE, 0, 0);
    TextField tf2 = new TextField();
    constrain(this, tf2, 2, 0, 1, 1,
        GridBagConstraints.NORTH, 0, 0, 0, 0, GridBagConstraints.NONE, 0, 0);
    Label label2 = new Label("More Text in label");
    constrain(this, label2, 3, 0, 1, 1,
        GridBagConstraints.NORTH, 0, 0, 0, 0, GridBagConstraints.NONE, 0, 0);
    Button button = new Button("Some button");
    constrain(this, button, 4, 0, 1, 1,
        GridBagConstraints.NORTH, 0, 0, 0, 0, GridBagConstraints.NONE, 0, 0);
}

static final void constrain(Container container, Component component, int grid_x, int grid_y,
    int grid_width, int grid_height, int anchor, int topPad, int leftPad, int bottomPad,
    int rightPad, int fill, double weightx, double weighty)
{
    GridBagConstraints c = new GridBagConstraints();
    c.gridx = grid_x;
    c.gridy = grid_y;
    c.gridwidth = grid_width;
    c.gridheight = grid_height;
    c.anchor = anchor;
    c.insets.top = topPad;
    c.insets.left = leftPad;
    c.insets.bottom= bottomPad;
    c.insets.right = rightPad;
    c.fill = fill;
    c.weightx = weightx;
    c.weighty = weighty;
    ((GridBagLayout)container.getLayout()).setConstraints(component, c);
    container.add(component);
}
} // END OF Class into_lap

If you have any insights, workarounds or comments about this test page please contact Mickey Segal.  A listing of  many Java resources is at this link.