I should now close the subject, because Fop2 server start to respond on the browsers request.
it happened just like that, without any action on the server. I'm happy that the FO2 works, but I don't know the reason of the server failures after upgrade.
Most probably it was your browser cache.
If you upgrade, you might have the old web app and javascript files in your cache, shift-reload a couple of times to force the reload is needed.
Best regards,
