Works great, though the HUD still has problems for me (i.e. I see the dialog background and title bar but there's nothing on it, no exit button, I can't see the sliders yet I can adjust guessing the position of the handles)
Please try, if it is the same for LWJGL and SWT. If it is, please try to set the WINDOW_Z_INDEX_UNIT constant in HUD class to a lower value and also play with the WINDOW_Z_INDEX_UNIT and WINDOW_Z_INDEX_UNIT_ASSEMBLER values in WidgetBase. If that does the trick, I can see, what I could do to fix it. Otherwise I need to further guess...

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Marvin