Traceback (most recent call last):
  File "/software/conda/envs/anaconda_2019.07/lib/python3.7/site-packages/matplotlib/backends/qt_editor/_formlayout.py", line 480, in apply
    self.apply_callback(self.formwidget.get())
  File "/software/conda/envs/anaconda_2019.07/lib/python3.7/site-packages/matplotlib/backends/qt_editor/figureoptions.py", line 207, in apply_callback
    axes.xaxis.set_units(xunits)
  File "/software/conda/envs/anaconda_2019.07/lib/python3.7/site-packages/matplotlib/axis.py", line 1574, in set_units
    self.callbacks.process('units')
  File "/software/conda/envs/anaconda_2019.07/lib/python3.7/site-packages/matplotlib/cbook/__init__.py", line 212, in process
    for cid, ref in list(self.callbacks.get(s, {}).items()):
RuntimeError: dictionary changed size during iteration
Aborted
(anaconda_2019.07) pfs@tron:~$ vncconfig &