Launch a JavaFX app locally. Then access the application via Remote Desktop. Then go back to the local desktop. (Possibly allow for screen blanker to kick in between these steps.)

The JavaFX app window may be completely blank, but responding as if controls are there. I see repeated messages in the console about a NPE on the JavaFX Application thread, but no stack trace (callback from JNI?)

My app implements a "Do you want to sve first?" dialog when shutting down. Hitting the native close button on the Window pops up a completely blank version of this dialog. The background color of it is not black, but a solid color, perhaps the platform default. It also behaves as if the controls are there, but nothing paints.