Hi, Daniel.
1. What build of GlassFish are you using?
2. What release of the JDK are you using?
3. One thing to try is to either have Java Web Start automatically open a Java console window when it launches or turn on tracing to a file. Take a look at the later part of this blog entry
http://blogs.sun.com/quinn/entry/launch_that_app_client for how to do either of those. The trace (or console) will contain any messages sent to System.out or System.err.
Let us know what you find.
- Tim
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