JRE 1.6 update 12 results in blank JTabbedPane tab content

Upon being updated to JRE 1.6 (12), one of many forms in my application displays a blank panel. In the application, forms display as a JPanel within JTabbedPanes. One type of form now always displays as blank. All other forms continue to display fine.
All is well in JRE 5, and even JRE 1.6 Update (7).
The application is here: http://cisr.nps.edu/cyberciege/downloads/setup-SDK-1-9m.exe
The code is massive and is grim -- but it works until update 12. It is the "Scenario.java" form that displays blank.
I build with JDK 1.5, but the problem still appears if I rebuild with JDK 1.6.0_12
What was "fixed" in JRE 1.6 (12) that would do such a thing?
--Mike

The answer is that the "blank" form's class had a "isValid()" method that was used for its own purposes, and thus broke the java component isValid mechanism.
Java 1.6 update 12 takes isValid() a little more seriously than past versions.
--Mike

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