diff --git a/setup.py b/setup.py
index a7c4a6a..1877fc9 100644
--- a/setup.py
+++ b/setup.py
@@ -18,12 +18,11 @@ def apply_folder_join(item):
     return os.path.join(BIN_FOLDER, item)
 
 
-if os.name is 'nt':
+if os.name == 'nt':
     bin_scripts = ['symoro-bin.py']
 else:
     bin_scripts = ['symoro-bin']
-bin_scripts = map(apply_folder_join, bin_scripts)
-
+bin_scripts = [apply_folder_join(x) for x in bin_scripts]
 
 setup(
     name='symoro',
@@ -34,9 +33,9 @@ def apply_folder_join(item):
     scripts=bin_scripts,
     packages=find_packages(exclude=['*.tests', '*.tests.*', 'tests.*', 'tests']),
     install_requires=[
-        'sympy==0.7.3',
+        'sympy>=0.7.3',
         'numpy>=1.6.1',
-        'wxPython>=2.8.11',
+        'wxPython==4.0.7',
         'PyOpenGL>=3.0.1b2'
     ],
     dependency_links=[
diff --git a/symoroui/layout.py b/symoroui/layout.py
index a7bee01..2526bbb 100644
--- a/symoroui/layout.py
+++ b/symoroui/layout.py
@@ -121,13 +121,13 @@ def params_in_grid(self, szr_grd, elements, rows, cols, width=70):
             place = elements[key].place
             handler = getattr(self, elements[key].handler)
             field_id = int(elements[key].id)
-            if control is 'cmb':
+            if control == 'cmb':
                 ctrl = wx.ComboBox(
                     parent=self.panel, style=wx.CB_READONLY,
                     size=(width, -1), name=name
                 )
                 ctrl.Bind(wx.EVT_COMBOBOX, handler)
-            elif control is 'lbl':
+            elif control == 'lbl':
                 ctrl = wx.StaticText(
                     parent=self.panel, size=(width, -1), name=name
                 )
diff --git a/symoroutils/configfile.py b/symoroutils/configfile.py
index aab3cc6..d7bf0f9 100644
--- a/symoroutils/configfile.py
+++ b/symoroutils/configfile.py
@@ -28,7 +28,7 @@ def get_prog_config_path():
          A string specifying the path to store SYMORO settings.
     """
     prog_name = 'symoro'
-    if os.name is 'nt':
+    if os.name == 'nt':
         return os.path.join(os.environ['APPDATA'], prog_name)
     else:
         return os.path.join(os.environ['HOME'], '.config', prog_name)
diff --git a/symoroviz/graphics.py b/symoroviz/graphics.py
index 294a678..210974a 100644
--- a/symoroviz/graphics.py
+++ b/symoroviz/graphics.py
@@ -9,7 +9,7 @@
 
 import wx
 import wx.lib.agw.floatspin as FS
-from wx.glcanvas import GLCanvas
+from wx.glcanvas import GLCanvas, GLContext
 
 import OpenGL.GL as gl
 import OpenGL.GLU as glu
@@ -34,6 +34,7 @@
 #TODO: Random button
 
 class VizGlCanvas(GLCanvas):
+
     def __init__(self, parent, robo, params, size=(600, 600)):
         super(VizGlCanvas, self).__init__(parent, size=size)
         self.Bind(wx.EVT_PAINT, self.OnPaintAll)
@@ -59,6 +60,8 @@ def __init__(self, parent, robo, params, size=(600, 600)):
         self.construct_hierarchy()
         self.dgms = {}
         self.l_solver = None
+        self._glContext = GLContext(self)
+
 
     def OnEraseBackground(self, event):
         # Do nothing, to avoid flashing on MSW.
@@ -140,8 +143,8 @@ def construct_hierarchy(self):
 
     def OnSize(self, event):
         size = self.size = self.GetClientSize()
-        if self.GetContext():
-            self.SetCurrent()
+        if self._glContext:
+            self._glContext.SetCurrent(self)
             gl.glViewport(0, 0, size.width, size.height)
             #gl.glMatrixMode(gl.GL_PROJECTION)
             #gl.glLoadIdentity()
@@ -244,7 +247,7 @@ def centralize_to_frame(self, index):
         self.Refresh(False)
 
     def OnPaintAll(self, event):
-        self.SetCurrent()
+        self._glContext.SetCurrent(self)
         if not self.init:
             self.InitGL()
             self.init = 1
@@ -469,7 +472,7 @@ def init_ui(self):
             choices.append("Frame " + str(jnt.index))
         self.drag_pos = None
         self.clb_frames = wx.CheckListBox(self.p, choices=choices)
-        self.clb_frames.SetChecked(range(len(choices)))
+        self.clb_frames.SetCheckedItems(range(len(choices)))
         self.clb_frames.Bind(wx.EVT_CHECKLISTBOX, self.CheckFrames)
         self.clb_frames.Bind(wx.EVT_LISTBOX, self.SelectFrames)
         grd_szr_control.Add(
@@ -573,7 +576,7 @@ def OnShowAllFrames(self, _):
         else:
             indices = []
         self.canvas.show_frames(indices)
-        self.clb_frames.SetChecked(indices)
+        self.clb_frames.SetCheckedItems(indices)
 
     def update_spin_controls(self):
         for ctrl in self.spin_ctrls.values():
diff --git a/symoroviz/primitives.py b/symoroviz/primitives.py
index c7bda5f..92c5900 100644
--- a/symoroviz/primitives.py
+++ b/symoroviz/primitives.py
@@ -9,6 +9,7 @@
 
 from numpy import sin, cos, pi
 
+import ctypes
 
 def create_cyl_array(radius, length, n_segments, centered=True):
     vertices, indices, normals = [], [], []
@@ -51,7 +52,7 @@ def create_sphere_array(radius, n_lat, n_long):
             normals += xn, yn, zn
             vertices += (x, y, z)
     # top and bottom indices
-    for i, start in enumerate([2, len(vertices)/3 - n_long]):
+    for i, start in enumerate([2, int(len(vertices)/3) - n_long]):
         for j in range(n_long):
             indices += (i, j + start, (j + 1) % n_long + start)
     # in-between