Trying to build a JavaFX RCP, I fire up the JavaFX Runtime during the startup process. I can see the following debugging ouput:
Prism pipeline init order: es2 j2d
Using openpisces for shapes, t2k for text rasterization
Not using dirty region optimizations
Prism pipeline name = com.sun.prism.es2.ES2Pipeline
(X) Got class = class com.sun.prism.es2.ES2Pipeline
GL_ARB_fragment_program detected (max instruction count is 16384)
Initialized prism pipeline: com.sun.prism.es2.ES2Pipeline
ES2Pipeline.isSupported factory.createGLPbuffer() took 27 ms [0.027 sec]
ES2Pipeline.isSupported pbuffer.getContext() took 0 ms [0.0 sec]
ES2Pipeline.isSupported context.makeCurrent() took 62 ms [0.062 sec]
ES2Pipeline.isSupported context.getGL().getGL2ES2() took 0 ms [0.0 sec]
JavaFX: using com.sun.javafx.tk.quantum.QuantumToolkit

this is the last ouput line. Looking at the stack in the debugger it seems to be stuck at

 MacApplication._runLoop
 MacApplication.runLoop: 73

I am calling the following code:

    System.out.println("Launch Java FX");
    long ms = System.currentTimeMillis();

    Application.launch(JavaFXRunLevel.class, new String[0]); // Get the JavaFX Application thread running...

    System.out.println("Launched Java FX in " + (System.currentTimeMillis() - ms) + "ms");


The exact same code works for me with the latest Windows builds (b38) without any problems.

Will try to supply an example project showing the problem if needed.