Plotting to a matplotlib / pyplot window does not work

I am trying to to make a wxPython program that controls a measurement 
instrument. The access to the instrument happens via a Python class. 
That class configures a matplotlib / pyplot window, where the measured 
data are plotted. In the wxPython application, the data acquisition 
(and hence the plotting) happens in a thread that is separate from the 
GUI, because this is a slow and long-running process that must not 
block the GUI.

If I use this class from within my wxPython application, the data 
plotting does not work. Plotting works fine if I use the instrument 
class without wxPython.

(The instrument class is here: 
<https://github.com/brennmat/ruediPy/blob/master/python/classes/rgams_SRS.py> 
)

Any thoughts what's going on? Any clues what to check or where to look 
for the reason why the  combination of matplotlib/pyplot with wxPython 
not work in my case?

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