diff --git a/online/serve/app/test/cases/github-share-online/index.html b/online/serve/app/test/cases/github-share-online/index.html
index 7a3509162..cbf7ab4de 100644
--- a/online/serve/app/test/cases/github-share-online/index.html
+++ b/online/serve/app/test/cases/github-share-online/index.html
@@ -12,6 +12,13 @@
 </head>
 <body>
   <article>
+    <p>
+      <ul>
+        <li>data from GitHub share</li>
+        <li>preview JSON in online format</li>
+        <li>shows all scenes</li>
+      </ul>
+    </p>
     <section>
       <vzome-viewer src="https://vorth.github.io/vzome-sharing/2024/06/03/09-54-50-863Z-heptagon-test/heptagon-test.vZome" show-scenes="all" >
       </vzome-viewer>
diff --git a/online/serve/app/test/cases/github-share/index.html b/online/serve/app/test/cases/github-share/index.html
index 3d717e905..87b34c440 100644
--- a/online/serve/app/test/cases/github-share/index.html
+++ b/online/serve/app/test/cases/github-share/index.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Test GitHub share URL</title>
+  <title>GitHub share, legacy preview</title>
 
   <link rel="stylesheet" href="../../vzome-viewer.css">
 
@@ -12,8 +12,15 @@
 </head>
 <body>
   <article>
+    <p>
+      <ul>
+        <li>data from GitHub share</li>
+        <li>preview JSON in legacy format</li>
+        <li>no scenes available</li>
+      </ul>
+    </p>
     <section>
-      <vzome-viewer src="https://raw.githubusercontent.com/vorth/vzome-sharing/main/2023/12/15/08-57-13-mirroring-red-strut/mirroring-red-strut.vZome" show-scenes="none" >
+      <vzome-viewer src="https://raw.githubusercontent.com/vorth/vzome-sharing/main/2023/12/15/08-57-13-mirroring-red-strut/mirroring-red-strut.vZome" show-scenes="all" >
       </vzome-viewer>
     </section>
   </article>
diff --git a/online/serve/app/test/gltf.html b/online/serve/app/test/gltf.html
index 02297ef5e..67005864a 100644
--- a/online/serve/app/test/gltf.html
+++ b/online/serve/app/test/gltf.html
@@ -2,7 +2,7 @@
 <html>
   <head>
     <meta charset="utf8">
-    <title>&lt;vzome-viewer&gt;</title>
+    <title>GLTF and VRML</title>
     <link rel="stylesheet" href="./vzome-viewer.css">
 
     <script type="module">
diff --git a/online/src/viewer/context/camera.jsx b/online/src/viewer/context/camera.jsx
index d57614ecb..b2814109b 100644
--- a/online/src/viewer/context/camera.jsx
+++ b/online/src/viewer/context/camera.jsx
@@ -41,7 +41,7 @@ const defaultScene = () => ({
   lighting: defaultLighting(),
   outlines: false,
   tweening: {
-    duration: 0,
+    duration: 500,
   }
 });
 
@@ -232,8 +232,7 @@ const CameraProvider = ( props ) =>
     tweenZoom
       .easing( Easing.Quadratic.InOut )
       .to( { distance }, duration )
-      .onUpdate( ({ distance }) => setDistance( distance ) )
-      .start();
+      .onUpdate( ({ distance }) => setDistance( distance ) );
 
     const [ cx, cy, cz ] = state.camera.lookAt;
     const tweenPan = new Tween( { x: cx, y: cy, z: cz } ); // start with current value
@@ -241,8 +240,7 @@ const CameraProvider = ( props ) =>
     tweenPan
       .easing( Easing.Quadratic.InOut )
       .to( { x, y, z }, duration )
-      .onUpdate( ({ x, y, z }) => setCamera( { lookAt: toVector( { x, y, z } ) } ) )
-      .start();
+      .onUpdate( ({ x, y, z }) => setCamera( { lookAt: toVector( { x, y, z } ) } ) );
 
     // HEAVILY adapted from https://stackoverflow.com/questions/28091876/tween-camera-position-while-rotation-with-slerp-three-js
 
@@ -264,8 +262,11 @@ const CameraProvider = ( props ) =>
         const up = toVector( new Vector3(0,1,0) .applyQuaternion( sourceQuaternion ) );
         const lookDir = toVector( new Vector3(0,0,-1) .applyQuaternion( sourceQuaternion ) );
         setCamera( { up, lookDir } );
-      })
-      .start();
+      });
+    
+    // We don't want to do this sync, since the tween duration may expire before subsequent
+    //  code in the caller finishes.
+    requestAnimationFrame( () => tweens .getAll() .map( tween => tween.start() ) );
   }
 
   const providerValue = {
