When I put text in the Dragboard in response to a Drag and Drop in my JFXPanel.. like this:

node.setOnDragDetected(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent me) {
logger.fine( "Drag Detected!");
Dragboard db = startDragAndDrop( TransferMode.COPY_OR_MOVE );
ClipboardContent cc = new ClipboardContent();
cc.putString("Hello");
db.setContent(cc);
me.consume();
}
});

The JavaFX Application thread is locked (forever) at WinDnDClipboard.push

Call stack looks like:
"JavaFX Application Thread" prio=6 tid=0x1c89ac00 nid=0x18f0 runnable [0x1b69f000]
   java.lang.Thread.State: RUNNABLE
at com.sun.glass.ui.win.WinDnDClipboard.push(Native Method)
at com.sun.glass.ui.win.WinSystemClipboard.pushToSystem(Unknown Source)
at com.sun.glass.ui.SystemClipboard.flush(Unknown Source)
at com.sun.glass.ui.ClipboardAssistance.flush(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumClipboard.flush(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.startDrag(Unknown Source)
at javafx.scene.Scene$DnDGesture.dragDetectedProcessed(Unknown Source)
at javafx.scene.Scene$DnDGesture.process(Unknown Source)
at javafx.scene.Scene$DnDGesture.access$6000(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.access$1200(Unknown Source)
at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at com.sun.javafx.tk.quantum.EmbeddedScene$2.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl$3.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(Unknown Source)
at com.sun.glass.ui.win.WinApplication$2$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:722)

   Locked ownable synchronizers:
- None