well.plot not displaying (pycharm community edition)

[JackofAllTrades01]

Hi there,

Exploring some tools for log analysis in the future and came across Welly. Looks amazing! Trying out some of the base features and I cannot get it to display a multiple track plot (which looks like the easiest thing to do!). Simple enough code to start with:

import welly
from welly import Well
import matplotlib.pyplot as plt

print(welly.version)

well = Well.from_las('c:/temp/las/demo.las')

header = well.header
location = well.location
latitude = well.location.latitude
longitude = well.location.longitude
curve_names = well._get_curve_mnemonics()

print (curve_names)
print (latitude)
print (longitude)

That works fine, and yields me a version (0.5.2) and the curves available in the file, as well as lat and long, so definitely connected ok.

0.5.2
['DTCO', 'DTRP', 'DTSM', 'DTTP', 'GR', 'TNPH', 'A16H', 'A16L', 'A22H', 'A22L', 'A28H', 'A28L', 'A34H', 'A34L', 'A40H', 'A40L', 'DRHB', 'DRHL', 'DRHO', 'DRHR', 'DRHU', 'HORD', 'P16H', 'P16L', 'P22H', 'P22L', 'P28H', 'P28L', 'P34H', 'P34L', 'P40H', 'P40L', 'PEB', 'PEF', 'PEL', 'PER', 'PEU', 'RHOB', 'ROBB', 'ROBL', 'ROBR', 'ROBU', 'VERD']
58 16 3.174 N
01 14 8.927 E

So far so good. If I try to plot a single track, that works well too:

gr=well.data['GR']
gr.plot()
plt.show()

Yields

It is when I try to do the multi track plot things fail.

datatoplot = ['MD', 'GR', 'HORD', 'RHOB', ['ROBB', 'ROBU'], 'MD']
well.plot(tracks=datatoplot)
plt.show()

yields nothing, even the simpler:

well.plot()
plt.show()

does nothing.

This is so simple, I am sure I am doing something very dumb, but I cannot see it. Any thoughts?