FULL PRODUCT VERSION :
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.10240]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Plugged in planar and/or 3M touchscreen

A DESCRIPTION OF THE PROBLEM :
This is related to bug: JDK-8132897

On Windows 10, opening a ComboBox through a click or touch will cause any JavaFX application to freeze.

We have found that the hang only happens when a touch screen is plugged in. (Surface Pro is always affected, while a PC with a USB touch screen will only have the freeze while the USB cable is plugged in)


REGRESSION. Last worked in version 8u40

ADDITIONAL REGRESSION INFORMATION:
Works in

java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b18)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Case 1:
Using a touch screen, touch a JavaFX ComboBox to make the popup appear
Touch outside of the popup to make it disappear

Case 2:
While a touch screen is plugged in
Click on a JavaFX ComboBox to make the popup appear
Click outside of the popup to make it disappear

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
ComboBox popup shows and hides
ACTUAL -
Application freezes

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class TestCMB extends Application {



public static void main(String[] args) {
        launch(args);
    }
    @Override
    public void start(Stage primaryStage) {
    
     HBox root = new HBox(10);
     Scene scene = new Scene(root);
     Button b = new Button("Click");
     ComboBox<String> cmb = new ComboBox<String>();
     cmb.getItems().addAll("item 1","item 2", "item 3");
     root.getChildren().addAll(b,cmb);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Works _ONLY_ when using the mouse, as soon as a touch input is used, the appliaction will freeze:

cmb.requestFocus();

If the ComboBox has the focus prior to being clicked, the application will not freeze unless a touch input is used.