ValueError after moving legend and rcParams.update #6113

import matplotlib.pyplot as plt
%matplotlib inline
import numpy as np

N = 100
x = np.arange(N)
plt.scatter(x,  x+ np.random.randn(N), label = "tips")
plt.legend()
ax = plt.gca()

# Locate the legend to the optimal position (automatic location does not work)
legend = ax.get_legend()
labels = (x.get_text() for x in legend.get_texts())
ax.legend(legend.legendHandles, labels, loc='lower right')

# Reset parameters
plt.matplotlib.rcParams.update(plt.matplotlib.rcParamsDefault)

# Plot again
plt.plot([0,1], [0,1])

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/usr/local/lib/python3.4/dist-packages/IPython/core/formatters.py in __call__(self, obj)
    335                 pass
    336             else:
--> 337                 return printer(obj)
    338             # Finally look for special method names
    339             method = _safe_get_formatter_method(obj, self.print_method)

/usr/local/lib/python3.4/dist-packages/IPython/core/pylabtools.py in <lambda>(fig)
    205 
    206     if 'png' in formats:
--> 207         png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))
    208     if 'retina' in formats or 'png2x' in formats:
    209         png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs))

/usr/local/lib/python3.4/dist-packages/IPython/core/pylabtools.py in print_figure(fig, fmt, bbox_inches, **kwargs)
    115 
    116     bytes_io = BytesIO()
--> 117     fig.canvas.print_figure(bytes_io, **kw)
    118     data = bytes_io.getvalue()
    119     if fmt == 'svg':

/usr/local/lib/python3.4/dist-packages/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, **kwargs)
   2149         origedgecolor = self.figure.get_edgecolor()
   2150 
-> 2151         self.figure.dpi = dpi
   2152         self.figure.set_facecolor(facecolor)
   2153         self.figure.set_edgecolor(edgecolor)

/usr/local/lib/python3.4/dist-packages/matplotlib/figure.py in _set_dpi(self, dpi)
    409     def _set_dpi(self, dpi):
    410         self._dpi = dpi
--> 411         self.dpi_scale_trans.clear().scale(dpi, dpi)
    412         self.callbacks.process('dpi_changed', self)
    413     dpi = property(_get_dpi, _set_dpi)

/usr/local/lib/python3.4/dist-packages/matplotlib/transforms.py in scale(self, sx, sy)
   1993         scale_mtx = np.array(
   1994             [[sx, 0.0, 0.0], [0.0, sy, 0.0], [0.0, 0.0, 1.0]],
-> 1995             np.float_)
   1996         self._mtx = np.dot(scale_mtx, self._mtx)
   1997         self.invalidate()

ValueError: could not convert string to float: 'figure'

<matplotlib.figure.Figure at 0x7fc0f80c3860>