diff --git a/modules/controls/src/main/java/javafx/scene/control/PopupControl.java b/modules/controls/src/main/java/javafx/scene/control/PopupControl.java
--- a/modules/controls/src/main/java/javafx/scene/control/PopupControl.java
+++ b/modules/controls/src/main/java/javafx/scene/control/PopupControl.java
@@ -30,6 +30,7 @@
 import java.util.List;
 
 import javafx.application.Application;
+import javafx.application.Platform;
 import javafx.beans.property.DoubleProperty;
 import javafx.beans.property.DoublePropertyBase;
 import javafx.beans.property.ObjectProperty;
@@ -111,7 +112,12 @@
         super();
         this.bridge = new CSSBridge();
         setAnchorLocation(AnchorLocation.CONTENT_TOP_LEFT);
-        getContent().add(bridge);
+
+        if (Platform.isFxApplicationThread()) {
+            getContent().add(bridge);
+        } else {
+            Platform.runLater(() -> getContent().add(bridge));
+        }
     }
 
     // TODO the fact that PopupWindow uses a group for auto-moving things
diff --git a/modules/controls/src/main/java/javafx/scene/control/Tooltip.java b/modules/controls/src/main/java/javafx/scene/control/Tooltip.java
--- a/modules/controls/src/main/java/javafx/scene/control/Tooltip.java
+++ b/modules/controls/src/main/java/javafx/scene/control/Tooltip.java
@@ -27,6 +27,7 @@
 
 
 import com.sun.javafx.css.StyleManager;
+import javafx.application.Platform;
 import javafx.css.SimpleStyleableBooleanProperty;
 import javafx.css.SimpleStyleableDoubleProperty;
 import javafx.css.SimpleStyleableObjectProperty;
@@ -158,7 +159,13 @@
         super();
         if (text != null) setText(text);
         bridge = new CSSBridge();
-        getContent().setAll(bridge);
+
+        if (Platform.isFxApplicationThread()) {
+            getContent().setAll(bridge);
+        } else {
+            Platform.runLater(() -> getContent().setAll(bridge));
+        }
+
         getStyleClass().setAll("tooltip");
     }
 
diff --git a/modules/graphics/src/main/java/javafx/stage/PopupWindow.java b/modules/graphics/src/main/java/javafx/stage/PopupWindow.java
--- a/modules/graphics/src/main/java/javafx/stage/PopupWindow.java
+++ b/modules/graphics/src/main/java/javafx/stage/PopupWindow.java
@@ -30,6 +30,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import javafx.application.Platform;
 import javafx.beans.InvalidationListener;
 import javafx.beans.Observable;
 import javafx.beans.property.BooleanProperty;
@@ -63,6 +64,8 @@
 import com.sun.javafx.stage.WindowEventDispatcher;
 import com.sun.javafx.tk.Toolkit;
 import java.security.AllPermission;
+import java.util.concurrent.CountDownLatch;
+
 import javafx.beans.property.ObjectPropertyBase;
 import javafx.beans.property.ReadOnlyObjectProperty;
 import javafx.beans.property.ReadOnlyObjectWrapper;
@@ -134,7 +137,17 @@
     
     private WeakChangeListener<Boolean> weakOwnerNodeListener = new WeakChangeListener(changeListener);
 
+    private final CountDownLatch sceneLatch = new CountDownLatch(1);
+
     public PopupWindow() {
+        if (Platform.isFxApplicationThread()) {
+            initScene();
+        } else {
+            Platform.runLater(() -> initScene());
+        }
+    }
+
+    private void initScene() {
         final Pane popupRoot = new Pane();
         popupRoot.setBackground(Background.EMPTY);
         popupRoot.getStyleClass().add("popup");
@@ -145,6 +158,7 @@
 
         popupRoot.layoutBoundsProperty().addListener(popupWindowUpdater);
         popupRoot.boundsInLocalProperty().addListener(popupWindowUpdater);
+
         scene.rootProperty().addListener(
                 new InvalidationListener() {
                     private Node oldRoot = scene.getRoot();
@@ -177,6 +191,8 @@
                         }
                     }
                 });
+
+        sceneLatch.countDown();
     }
 
     /**
@@ -189,7 +205,7 @@
      */
     @Deprecated
     protected ObservableList<Node> getContent() {
-        final Parent rootNode = getScene().getRoot();
+        final Parent rootNode = getPopupWindowScene().getRoot();
         if (rootNode instanceof Group) {
             return ((Group) rootNode).getChildren();
         }
@@ -241,6 +257,15 @@
         throw new UnsupportedOperationException();
     }
 
+    private Scene getPopupWindowScene() {
+        try {
+            sceneLatch.await();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        return getScene();
+    }
+
     /**
      * This convenience variable indicates whether, when the popup is shown,
      * it should automatically correct its position such that it doesn't end
@@ -426,7 +451,7 @@
             owner.showingProperty().addListener(weakOwnerNodeListener);
         }
 
-        final Scene sceneValue = getScene();
+        final Scene sceneValue = getPopupWindowScene();
         SceneHelper.parentEffectiveOrientationInvalidated(sceneValue);            
         
         // RT-28447
@@ -681,7 +706,7 @@
 
     private Bounds getExtendedBounds() {
         if (cachedExtendedBounds == null) {
-            final Parent rootNode = getScene().getRoot();
+            final Parent rootNode = getPopupWindowScene().getRoot();
             cachedExtendedBounds = union(rootNode.getLayoutBounds(),
                                          rootNode.getBoundsInLocal());
         }
@@ -692,7 +717,7 @@
     private Bounds getAnchorBounds() {
         if (cachedAnchorBounds == null) {
             cachedAnchorBounds = getAnchorLocation().isContentLocation()
-                                         ? getScene().getRoot()
+                                         ? getPopupWindowScene().getRoot()
                                                      .getLayoutBounds()
                                          : getExtendedBounds();
         }
@@ -703,7 +728,7 @@
     private void updateWindow(final double newAnchorX,
                               final double newAnchorY) {
         final AnchorLocation anchorLocationValue = getAnchorLocation();
-        final Parent rootNode = getScene().getRoot();
+        final Parent rootNode = getPopupWindowScene().getRoot();
         final Bounds extendedBounds = getExtendedBounds();
         final Bounds anchorBounds = getAnchorBounds();