fix pg

Playground/index.html

@@ -53,7 +53,7 @@
         <script src="https://rawgit.com/BabylonJS/Extensions/master/ClonerSystem/src/babylonx.cloner.js" async></script>
         <script src="https://rawgit.com/BabylonJS/Extensions/master/CompoundShader/src/babylonx.CompoundShader.js" async></script>
         <script src="https://www.babylontoolkit.com/playground/scripts/babylon.navmesh.js" async></script>
-        <script src="https://www.babylontoolkit.com/playground/scripts/babylon.manager.js" async></script>
+        <script src="https://www.babylontoolkit.com/playground/scripts/babylon.manager.js"></script>
                                
         <link href="css/index.css" rel="stylesheet" />
     </head>