[Matplotlib-users] Intermittent lock-ups when using QtAgg backend

[Slavin, Jonathan]

Hi,

For some time now I have run into intermittent lock-ups when using the
QtAgg backend. By this I mean, when at the command line I do "ipython
--pylab" I get what appears to be a normal startup:
Python 3.8.13 | packaged by conda-forge | (default, Mar 25 2022, 06:04:10)
Type 'copyright', 'credits' or 'license' for more information
IPython 8.4.0 -- An enhanced Interactive Python. Type '?' for help.
Using matplotlib backend: QtAgg

In [1]:

But then the terminal is completely unresponsive. Typing produces no output
and even ctrl-c or ctrl-z do nothing. To kill the session requires me to
kill the process in a different terminal window. This does not correlate
with anything I've been able to identify. When this happens I switch my
backend to TkAgg which then works (but has less functionality than QtAgg).
Since I prefer the QtAgg backend I generally try it again after some
period, and often it then works normally. So this is mysterious. Can anyone
recommend how to diagnose the cause of this behavior?

Thanks,
Jon
-- 
Jonathan D. Slavin (he/him)
Astrophysicist - High Energy Astrophysics Division
Center for Astrophysics | Harvard & Smithsonian
Office: (617) 496-7981 | Cell: (781) 363-0035
60 Garden Street | MS 04 | Cambridge, MA 02138
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