FULL PRODUCT VERSION :
Standard edition 1.6.0-rc-b64, mixed mode, sharing

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
Pressing the Enter key results in an alert tone beep when focus is in a TextField.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1.  Run the applet with source code given below.  A working applet and the source code are at segal.org/java/beeping_textfield/.
2.  Click in the TextField to get focus
3.  Press the Enter key

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No sound should be produced.
ACTUAL -
An alert sound is produced.  This is a problem because it suggests to the user that they did something wrong or the program malfunctioned.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.applet.*;
import java.awt.*;

public class beeping_textfield extends Applet {

public void init()
{
    setBackground(new Color(200, 150, 200));
    TextField textField = new TextField();
    add(textField);
}
} // END OF Class beeping_textfield

---------- END SOURCE ----------

Release Regression From : 5.0u6
The above release value was the last known release where this 
bug was known to work. Since then there has been a regression.