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Cross posted at Applet Security Warning and Class Loaders - CodeGuru Forums

Sorry, I know nothing about your environment. I just noticed the Incompatible magic value problem and was curious what the number was. It looks like the browser(?) was trying to read a class file...

That looks like a corrupted class file.
If you convert the decimal value shown to hex you get: 218762506= d0a0d0a
That looks like the characters: \r\n\r\n or two lineend groups