diff --git a/tftb/processing/base.py b/tftb/processing/base.py
index bee2e57..8bc1e08 100644
--- a/tftb/processing/base.py
+++ b/tftb/processing/base.py
@@ -61,7 +61,8 @@ def _make_window(self):
         h += 1 - np.remainder(h, 2)
         from scipy import hamming
         fwindow = hamming(int(h))
-        fwindow = fwindow / np.linalg.norm(fwindow)
+        # No need to normalize the window
+        # fwindow = fwindow / np.linalg.norm(fwindow)
         return fwindow
 
     def plot(self, ax=None, kind='cmap', show=True, default_annotation=True,
diff --git a/tftb/processing/cohen.py b/tftb/processing/cohen.py
index 0a36bd6..96bb837 100644
--- a/tftb/processing/cohen.py
+++ b/tftb/processing/cohen.py
@@ -258,5 +258,6 @@ def smoothed_pseudo_wigner_ville(signal, timestamps=None, freq_bins=None,
     from tftb.generators import fmlin
     sig = fmlin(128, 0.1, 0.4)[0]
     spec = PseudoWignerVilleDistribution(sig)
-    spec.run()
-    spec.plot()
+    tfr, _, _ = spec.run()
+    from scipy.io import savemat
+    savemat("/tmp/foo.mat", dict(tfr2=tfr))
diff --git a/tftb/processing/tests/test_cohen.py b/tftb/processing/tests/test_cohen.py
index 5bdd7d0..ed9994b 100644
--- a/tftb/processing/tests/test_cohen.py
+++ b/tftb/processing/tests/test_cohen.py
@@ -16,7 +16,6 @@
 from tftb.processing import cohen
 from tftb.generators import fmsin, fmlin
 from tftb.tests.base import TestBase
-from nose import SkipTest
 
 
 class TestCohen(TestBase):
@@ -75,7 +74,6 @@ def test_wigner_ville_regionprops(self):
 
     def test_pseudo_wv_energy(self):
         """Test the energy property of the pseudo WV representation."""
-        raise SkipTest("Known failure.")
         signal, _ = fmsin(128)
         signal = signal / 128.0
         tfr, _, _ = cohen.PseudoWignerVilleDistribution(signal).run()