diff -r cec4c5d9c2d6 javafx-ui-common/src/com/sun/javafx/application/PlatformImpl.java
--- a/javafx-ui-common/src/com/sun/javafx/application/PlatformImpl.java	Tue Apr 23 11:26:02 2013 +1200
+++ b/javafx-ui-common/src/com/sun/javafx/application/PlatformImpl.java	Tue Apr 23 14:04:36 2013 -0700
@@ -506,8 +506,7 @@
      * name constants.
      */
     public static void setPlatformUserAgentStylesheet(String stylesheetUrl) {
-        isModena = Application.STYLESHEET_MODENA.equals(stylesheetUrl);
-        isCaspian = Application.STYLESHEET_CASPIAN.equals(stylesheetUrl);
+        isModena = isCaspian = false;
         // check for command line override
         String overrideStylesheetUrl =
                 AccessController.doPrivileged(
@@ -519,6 +518,7 @@
         if (overrideStylesheetUrl != null) stylesheetUrl = overrideStylesheetUrl;
         // check for named theme constants for modena and caspian
         if (Application.STYLESHEET_CASPIAN.equalsIgnoreCase(stylesheetUrl)) {
+            isCaspian = true;
             AccessController.doPrivileged(
                     new PrivilegedAction() {
                         @Override public Object run() {
@@ -535,6 +535,7 @@
                         }
                     });
         } else if (Application.STYLESHEET_MODENA.equalsIgnoreCase(stylesheetUrl)) {
+            isModena = true;
             AccessController.doPrivileged(
                     new PrivilegedAction() {
                         @Override public Object run() {
diff -r cec4c5d9c2d6 javafx-ui-common/src/javafx/application/Application.java
--- a/javafx-ui-common/src/javafx/application/Application.java	Tue Apr 23 11:26:02 2013 +1200
+++ b/javafx-ui-common/src/javafx/application/Application.java	Tue Apr 23 14:04:36 2013 -0700
@@ -383,17 +383,6 @@
     }
 
     private static String userAgentStylesheet = null;
-    static {
-        userAgentStylesheet = AccessController.doPrivileged(
-            new PrivilegedAction<String>() {
-                public String run() {
-                    return System.getProperty("javafx.application.userAgentStylesheet",null);
-                }
-            });
-        if (userAgentStylesheet != null) {
-            StyleManager.getInstance().setDefaultUserAgentStylesheet(null, userAgentStylesheet);
-        }
-    }
 
     /**
      * Get the user agent stylesheet used by the whole application. This is