interact with more than one figure at the same time

[berceanu]

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I am trying to use Interact.jl with PyPlot to control various figures with a single slider. The notebook I have so far is at http://nbviewer.ipython.org/github/berceanu/topo-photon/blob/master/anc/exploratory.ipynb However, I am facing various problems. 1. The first one is that sometimes I get the following error instead of a plot as output of the #plot spectrum cell. If I then re-evaluate the cell, everything gets back to normal.

PyError (:PyObject_Call) <class 'AttributeError'>
AttributeError("'FontProperties' object has no attribute '_family'",)
  File "/usr/lib/python3.4/site-packages/matplotlib/backend_bases.py", line 2158, in print_figure
    **kwargs)
  File "/usr/lib/python3.4/site-packages/matplotlib/backends/backend_agg.py", line 521, in print_png
    FigureCanvasAgg.draw(self)
  File "/usr/lib/python3.4/site-packages/matplotlib/backends/backend_agg.py", line 469, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python3.4/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python3.4/site-packages/matplotlib/figure.py", line 1017, in draw
    self.tight_layout(renderer, **self._tight_parameters)
  File "/usr/lib/python3.4/site-packages/matplotlib/figure.py", line 1663, in tight_layout
    rect=rect)
  File "/usr/lib/python3.4/site-packages/matplotlib/tight_layout.py", line 352, in get_tight_layout_figure
    pad=pad, h_pad=h_pad, w_pad=w_pad)
  File "/usr/lib/python3.4/site-packages/matplotlib/tight_layout.py", line 129, in auto_adjust_subplotpars
    tight_bbox_raw = union([ax.get_tightbbox(renderer) for ax in subplots])
  File "/usr/lib/python3.4/site-packages/matplotlib/tight_layout.py", line 129, in <listcomp>
    tight_bbox_raw = union([ax.get_tightbbox(renderer) for ax in subplots])
  File "/usr/lib/python3.4/site-packages/matplotlib/axes/_base.py", line 3276, in get_tightbbox
    bb_xaxis = self.xaxis.get_tightbbox(renderer)
  File "/usr/lib/python3.4/site-packages/matplotlib/axis.py", line 1082, in get_tightbbox
    renderer)
  File "/usr/lib/python3.4/site-packages/matplotlib/axis.py", line 1065, in _get_tick_bboxes
    extent = tick.label1.get_window_extent(renderer)
  File "/usr/lib/python3.4/site-packages/matplotlib/text.py", line 798, in get_window_extent
    bbox, info, descent = self._get_layout(self._renderer)
  File "/usr/lib/python3.4/site-packages/matplotlib/text.py", line 293, in _get_layout
    key = self.get_prop_tup()
  File "/usr/lib/python3.4/site-packages/matplotlib/text.py", line 743, in get_prop_tup
    hash(self._fontproperties),
  File "/usr/lib/python3.4/site-packages/matplotlib/font_manager.py", line 702, in __hash__
    l = (tuple(self.get_family()),
  File "/usr/lib/python3.4/site-packages/matplotlib/font_manager.py", line 724, in get_family
    if self._family is None:


 in pyerr_check at /home/berceanu/.julia/v0.3/PyCall/src/exception.jl:58
 in pycall at /home/berceanu/.julia/v0.3/PyCall/src/PyCall.jl:91
 in fn at /home/berceanu/.julia/v0.3/PyCall/src/conversions.jl:181
 in writemime at /home/berceanu/.julia/v0.3/PyPlot/src/PyPlot.jl:222
 in writemime at /home/berceanu/.julia/v0.3/Interact/src/IJulia/setup.jl:91
 in base64 at base64.jl:125
 in display_dict at /home/berceanu/.julia/v0.3/IJulia/src/execute_request.jl:34

1. the second issue I am facing is that the kernel seems to die at random intervals, for no particular reason, which I find quite frustrating.
2. sometimes an empty figure frame is drawn and mixed with the output from other code cells

Am I doing something terribly wrong in my code? The non-plotting part of the code is well tested outside of IJulia, so I know that gives no issues.