JavaFX 1.2 breaks compatibility with 64bit linux. JavaFX 1.1 worked fine on that system.

(Note: apps started with netbeans work fine so far)

applets do not start at all (no console).

webstart apps exit with the following exception (app was widgetfx, clearing the cache did not help):
java.lang.NoClassDefFoundError: com/sun/javafx/runtime/Main
at com.sun.javafx.runtime.main.Main.main(Main.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.javaws.Launcher.executeApplication(Launcher.java:1468)
at com.sun.javaws.Launcher.executeMainClass(Launcher.java:1414)
at com.sun.javaws.Launcher.doLaunchApp(Launcher.java:1225)
at com.sun.javaws.Launcher.run(Launcher.java:114)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: com.sun.javafx.runtime.Main
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at com.sun.jnlp.JNLPClassLoader.findClass(JNLPClassLoader.java:257)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 10 more
#### Java Web Start Error:
#### null