diff --git a/examples/Examples.ipynb b/examples/Examples.ipynb
index 76ceebf2..893e26a3 100644
--- a/examples/Examples.ipynb
+++ b/examples/Examples.ipynb
@@ -185,7 +185,7 @@
     "size = int(32) # size of image\n",
     "im = np.zeros((size,size)) # create zero image\n",
     "points = size*np.random.random((2, n**2)) # locations of seed values\n",
-    "im[(points[0]).astype(np.int), (points[1]).astype(np.int)] = size # seed high values\n",
+    "im[(points[0]).astype(np.int32), (points[1]).astype(np.int32)] = size # seed high values\n",
     "im = ndimage.gaussian_filter(im, sigma=size/(float(4)*n)) # smooth high values into surrounding areas\n",
     "im *= 1/np.max(im)# rescale to be in the range [0,1]\n",
     "rgba_im = img_as_ubyte(jet(im)) # convert the values to rgba image using the jet colormap\n",
diff --git a/examples/Picker.ipynb b/examples/Picker.ipynb
index bc85ddd0..0c8f063c 100644
--- a/examples/Picker.ipynb
+++ b/examples/Picker.ipynb
@@ -224,7 +224,7 @@
     "scene.add(hover_point)\n",
     "\n",
     "# Have sphere follow picker point:\n",
-    "jslink((hover_point, 'position'), (hover_picker, 'point'))"
+    "jslink((hover_point, 'position'), (hover_picker, 'point'));"
    ]
   },
   {
@@ -254,7 +254,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Next, we set up a picker for when the user double clikcs on the surface. This should trigger the execution and visualization of the alogrithm."
+    "Finally, we set up a picker for when the user double clikcs on the surface. This should trigger the execution and visualization of the alogrithm."
    ]
   },
   {
diff --git a/examples/Shadows.ipynb b/examples/Shadows.ipynb
index 2ea744e8..fa8a0295 100644
--- a/examples/Shadows.ipynb
+++ b/examples/Shadows.ipynb
@@ -244,7 +244,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Here, we can see that there is some pixelation of the shadows (although it is smoothed by using `PCFSoftShadowMap`). This can be fixed by increasing the resolution of the shadow map:"
+    "Here, we can see that there is some pixelation of the shadows (although it is smoothed by using `PCFSoftShadowMap`). This can be adjusted by increasing the resolution of the shadow map:"
    ]
   },
   {
diff --git a/examples/superellipsoid.ipynb b/examples/superellipsoid.ipynb
index 65abae58..23245bbe 100644
--- a/examples/superellipsoid.ipynb
+++ b/examples/superellipsoid.ipynb
@@ -114,13 +114,13 @@
    "outputs": [],
    "source": [
     "from pythreejs import *\n",
-    "from ipydatawidgets import ConstrainedNDArrayWidget\n",
+    "from ipydatawidgets import create_constrained_arraywidget \n",
     "from IPython.display import display\n",
     "\n",
     "view_width = 600\n",
     "view_height = 400\n",
     "\n",
-    "coordinate_widget = ConstrainedNDArrayWidget(dtype='float32')(array=coords)\n",
+    "coordinate_widget = create_constrained_arraywidget(dtype='float32')(array=coords)\n",
     "\n",
     "surf_g = BufferGeometry(attributes=dict(\n",
     "    position=BufferAttribute(coordinate_widget),\n",
diff --git a/examples/threejs/voxel_painter.ipynb b/examples/threejs/voxel_painter.ipynb
index 17cc9f89..933666f0 100644
--- a/examples/threejs/voxel_painter.ipynb
+++ b/examples/threejs/voxel_painter.ipynb
@@ -21,15 +21,6 @@
     "    - Delete voxel when shift-clicked"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "from __future__ import division, print_function"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": null,
diff --git a/js/scripts/templates/py_top_level_init.mustache b/js/scripts/templates/py_top_level_init.mustache
index f4957d37..4556dfbc 100644
--- a/js/scripts/templates/py_top_level_init.mustache
+++ b/js/scripts/templates/py_top_level_init.mustache
@@ -2,8 +2,6 @@
 # This file automatically generated by {{ generateScriptName }}
 #
 
-from __future__ import absolute_import
-
 {{#each modules as |module|}}
 from {{ module.pyRelativePath }} import *
 {{/each}}
diff --git a/js/src/_base/Renderable.js b/js/src/_base/Renderable.js
index a5695ff4..38e67d02 100644
--- a/js/src/_base/Renderable.js
+++ b/js/src/_base/Renderable.js
@@ -427,6 +427,10 @@ class RenderableView extends widgets.DOMWidgetView {
 
         this.updateSize();
 
+        // We need to ensure that renderer properties are applied
+        // (we have no idea where the renderer has been...)
+        this.updateProperties(true);
+
         this.debug('ThreeView.acquireRenderer(' + this.renderer.poolId + ')');
     }
 
diff --git a/js/src/_base/Three.js b/js/src/_base/Three.js
index 7f09d79c..10a260c2 100644
--- a/js/src/_base/Three.js
+++ b/js/src/_base/Three.js
@@ -440,7 +440,7 @@ class ThreeModel extends widgets.WidgetModel {
             toSet[propName] = converterFn.bind(this)(this.obj[propName], propName);
         }, this);
 
-        if (toSet) {
+        if (Object.keys(toSet).length) {
             // Apply all direct changes at once
             this.set(toSet, 'pushFromThree');
         }
diff --git a/js/src/core/Renderer.js b/js/src/core/Renderer.js
index 1395ffc9..e9d0fdf1 100644
--- a/js/src/core/Renderer.js
+++ b/js/src/core/Renderer.js
@@ -166,14 +166,6 @@ class RendererView extends RenderableView {
         }
     }
 
-    acquireRenderer() {
-        RenderableView.prototype.acquireRenderer.call(this);
-
-        // We need to ensure that renderer properties are applied
-        // (we have no idea where the renderer has been...)
-        this.updateProperties(true);
-    }
-
 }
 
 module.exports = {
diff --git a/js/src/renderers/WebGLRenderer.js b/js/src/renderers/WebGLRenderer.js
index 0c5a94bb..db626391 100644
--- a/js/src/renderers/WebGLRenderer.js
+++ b/js/src/renderers/WebGLRenderer.js
@@ -55,14 +55,6 @@ class WebGLRendererView extends RenderableView {
         console.log('WGLR(' + this.id + '): ' + str);
     }
 
-    acquireRenderer() {
-        RenderableView.prototype.acquireRenderer.call(this);
-
-        // We need to ensure that renderer properties are applied
-        // (we have no idea where the renderer has been...)
-        this.updateProperties();
-    }
-
     //
     // Handlers
     //
diff --git a/js/src/renderers/webgl/WebGLShadowMap.js b/js/src/renderers/webgl/WebGLShadowMap.js
index 446571a3..442fad0c 100644
--- a/js/src/renderers/webgl/WebGLShadowMap.js
+++ b/js/src/renderers/webgl/WebGLShadowMap.js
@@ -24,7 +24,7 @@ class WebGLShadowMapModel extends WebGLShadowMapAutogenModel {
         // Leave this to Renderable
     }
 
-    synToModel(syncAllProps) {
+    syncToModel(syncAllProps) {
         // Leave this to Renderable
     }
 
diff --git a/pythreejs/pythreejs.py b/pythreejs/pythreejs.py
index eac12154..9119ea18 100644
--- a/pythreejs/pythreejs.py
+++ b/pythreejs/pythreejs.py
@@ -9,8 +9,6 @@
 will use this foundation to build higher-level interfaces to build 3d plots.
 """
 
-from __future__ import absolute_import
-
 from ipywidgets import Widget, widget_serialization
 from traitlets import Unicode, CInt, Instance, List, CFloat, Bool, observe, validate
 import numpy as np