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As suggested by astrand
adding a try ... except clause in the file subprocess.py did
the job
I had to add that try ... except clause in 2 places
if you look in the file there are 2 instances were
list.remove(x) occurs unprotected.

try:
 list.remove(x)
except:
 pass

I have worked with 2.4.0, 2.4.1 and 2.4.2 and all three
needed the patch.
Hope this helps.