diff -r df3ce8a3d2aa javafx-ui-common/src/com/sun/javafx/application/LauncherImpl.java
--- a/javafx-ui-common/src/com/sun/javafx/application/LauncherImpl.java	Wed Mar 06 16:26:43 2013 +0100
+++ b/javafx-ui-common/src/com/sun/javafx/application/LauncherImpl.java	Wed Mar 06 15:07:28 2013 -0500
@@ -653,22 +653,24 @@
         PlatformImpl.addListener(listener);
 
         try {
-            Preloader pldr = null;
+            final Preloader [] pldr = new Preloader [1];
             if (preloaderClass != null) {
-                // Construct an instance of the preloader and call its init
-                // method on this thread. Then call the start method on the FX thread.
-                try {
-                    Constructor<? extends Preloader> c = preloaderClass.getConstructor();
-                    pldr = c.newInstance();
-                    // Set startup parameters
-                    ParametersImpl.registerParameters(pldr, new ParametersImpl(args));
-                } catch (Throwable t) {
-                    System.err.println("Exception in Preloader constructor");
-                    pConstructorError = t;
-                    error = true;
-                }
+                PlatformImpl.runAndWait(new Runnable() {
+                    @Override public void run() {
+                        try {
+                            Constructor<? extends Preloader> c = preloaderClass.getConstructor();
+                            pldr[0] = c.newInstance();
+                            // Set startup parameters
+                            ParametersImpl.registerParameters(pldr[0], new ParametersImpl(args));
+                        } catch (Throwable t) {
+                            System.err.println("Exception in Preloader constructor");
+                            pConstructorError = t;
+                            error = true;
+                        }
+                    }
+                });
             }
-            currentPreloader = pldr;
+            currentPreloader = pldr[0];
 
             // Call init method unless exit called or error detected
             if (currentPreloader != null && !error && !exitCalled.get()) {
@@ -710,7 +712,7 @@
 
             // Construct an instance of the application and call its init
             // method on this thread. Then call the start method on the FX thread.
-            Application app = null;
+            final Application [] app = new Application [1];
             if (!error && !exitCalled.get()) {
                 if (currentPreloader != null) {
                     if (simulateSlowProgress) {
@@ -724,18 +726,22 @@
                             StateChangeNotification.Type.BEFORE_LOAD, null);
                 }
 
-                try {
-                    Constructor<? extends Application> c = appClass.getConstructor();
-                    app = c.newInstance();
-                    // Set startup parameters
-                    ParametersImpl.registerParameters(app, new ParametersImpl(args));
-                } catch (Throwable t) {
-                    System.err.println("Exception in Application constructor");
-                    constructorError = t;
-                    error = true;
-                }
+                PlatformImpl.runAndWait(new Runnable() {
+                    @Override public void run() {
+                        try {
+                            final Constructor<? extends Application> c = appClass.getConstructor();
+                            app[0] = c.newInstance();
+                            // Set startup parameters
+                            ParametersImpl.registerParameters(app[0], new ParametersImpl(args));
+                        } catch (Throwable t) {
+                            System.err.println("Exception in Application constructor");
+                            constructorError = t;
+                            error = true;
+                        }
+                    }
+                });
             }
-            final Application theApp = app;
+            final Application theApp = app[0];
 
             // Call init method unless exit called or error detected
             if (!error && !exitCalled.get()) {