Java HotSpot Virtual Machine

To begin, I'm not sure if this will be a Java problem or an XP problem, but I'm throwing it out there to see if anyone has seen it.

We are in the process of converting from NT 4.0 to XP, and one of our sites has done so quite well, with over 20 people using a Java application. Another location, however, cannot use the application on XP.

What happens is the application is downloaded an launched and the user logs into the application. It appears that authentication is successful while authorization is failing. (intentionally providing incorrect credentials provides a different error). Login is performed through https.

Now the problem is: these same credentials and application run fine in NT, fine on XP at the converted location, and fine on XP on a non-imaged PC, as well as a small handful of imaged PCs. We know the image is good as well as the network, and are truely stumped.

The application uses any of the 1.5 JVM and I have successfully tested it on Updates 4, 6, and 9. Any help would be appreciated if anyone know of a setting we are missing or something.

Thanks in advance.