FULL PRODUCT VERSION :
java version "1.6.0-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-rc-b71)
Java HotSpot(TM) Client VM (build 1.6.0-rc-b71, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows XP [Wersja 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
Keyboard shortcut for menu items work only once. For the first time after application has been launched correct menu option is executed, no matter which. But when I press again the same keyboard shortcut, or any other defined shortcut, nothing happens. But when I swicth to another application (by Windows Alt+Tab), then when I am back the shortcut works again but again only once.

In J2SE 5 everything works properly.

Keyboard shortcut was defined by means of setAccelerator(),

menuItem.setMnemonic('a');
menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,ActionEvent.CTRL_MASK));

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :

I have prepared small example program (only 10kb in zip file). The file
contains two directories src -- with sources in one package, (this is remnants of a larger application)
install -- with two further subdirectories:
-> deploy -- which contains a jar file and a StartTestMenu6.bat file to execute this jar. Jar mainifest do not specify main class, so the bat file is neccessary, this jar was created with Java 5 update 6
-> scripts -- simple bat to create jar file.

To observe incorrect behavior simply run the StartTestMenu6.bat (change
path to java.exe before you do this) , then after the main window appears
press for example Ctrl+M. That results in a message box, close it and
press Ctrl+M again. Now nothing happens.

REPRODUCIBILITY :
This bug can be reproduced always.

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Attached seperatly
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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.