When i try to load the demo at
http://download.oracle.com/otndocs/products/javafx/samples/Ensemble/index.html
javafx crashes always before loading the demo.

The only demo which works for me in firefox at http://www.javafx.com/about-javafx/:
http://download.oracle.com/otndocs/products/javafx/samples/SwingInterop/index.html

Sometimes I succeed to see an error message in the Java Console with the following error message:
Exception in thread "Thread-14" java.lang.InternalError: Invalid window handle.

All the examples do work in internet explorer.