I got a user with a "invalid keystore format" problem He's running Windows XP and it happens when our java webstart application is starting up. He had a mix of java 5 and java 6.
We uninstalled all his javas and deleted his c:\program files\java\jre6\lib\security\cacerts file as suggest by my company's support people and reinstalled java 6 U 22 and he still has the problem.
The other users don't have a problem.
How do we get our java web start application on work for him? It a java application and not a java applet.
He got a new Dell laptop a couple of months ago and it has never worked for him. That model of laptop works for other users.