Java Web Start lwjgl app hangs at first execution but thereafter runs forever


I am close to finish my first JME Project

I want to deploy it via Java Web Start using lwjgl-extension.php for native libraries.

The problem is that the application hangs only at the very first execution on a newly installed system. After this, for the 2nd to x-th execution everything works perfectly. Even a complete deinstall of java, JWS-Application, or the lwjgl ressource-files can not force the system to hang again.

Does it sound familiar to you? Do you have an idea what the problem is about?

Should I use my own lwjgl sources instead of using the ?

Thanks a lot for your time!