Hi Ryne,

thanks for your quick answer. I tried again with a fresh install, for me it 
does not fix the issue. I have installed as well django-modeltranslation 
and mezzanine-pagedown.
It works under 4.1 could you please let me know what you  exactly do.

Thank you very much
Gerhard



Am Mittwoch, 14. September 2016 12:26:26 UTC+2 schrieb Gerhard 
Spitzlsperger:
>
> Dear All,
>
> I tried to upgrade mezzanine from 4.1 to 4.2 and the system crashed. As I 
> did not find somethin different I did a naive pip3 --upgrade. I tried to 
> sites (one pretty fresh created under 4.1)
>
> both sites are deployed using apache2.4 and mod_wsgi
>
> after downgrading again to 4.1 everything worked.
>
> Thanks a lot for any hint
> Gerhard
>
> Traceback (most recent call last):
> [:error] [pid 9181] [remote ...:40070]   File 
> "/home/django/mezzanine/blueberrye/blueberrye/wsgi.py", line 29, in <module>
> [:error] [pid 9181] [remote ...:40070]     application = 
> get_wsgi_application()
> [:error] [pid 9181] [remote ...:40070]   File 
> "/home/django/mezzanine/lib/python3.4/site-packages/django/core/wsgi.py", 
> line 13, in get_wsgi_application
> [:error] [pid 9181] [remote ...:40070]     django.setup(set_prefix=False)
> [:error] [pid 9181] [remote ...:40070]   File 
> "/home/django/mezzanine/lib/python3.4/site-packages/django/__init__.py", 
> line 27, in setup
> [:error] [pid 9181] [remote ...:40070]     
> apps.populate(settings.INSTALLED_APPS)
> [:error] [pid 9181] [remote ...:40070]   File 
> "/home/django/mezzanine/lib/python3.4/site-packages/django/apps/registry.py", 
> line 78, in populate
> [:error] [pid 9181] [remote ...:40070]     raise RuntimeError("populate() 
> isn't reentrant")
> [:error] [pid 9181] [remote ...:40070] RuntimeError: populate() isn't 
> reentrant
> [[:info] [pid 9181] mod_wsgi (pid=9181): Shutdown requested 
> 'blueberrye.cc'.
> [:info] [pid 9181] mod_wsgi (pid=9181): Stopping process 'blueberrye.cc'.
> [:info] [pid 9181] mod_wsgi (pid=9181): Destroying interpreters.
> [:info] [pid 9181] mod_wsgi (pid=9181): Destroy interpreter 
> 'blueberrye.cc|'.
> [:error] [pid 9181] Exception ignored in: <module 'threading' from 
> '/usr/lib/python3.4/threading.py'>
> [:error] [pid 9181] Traceback (most recent call last):
> [:error] [pid 9181]   File "/usr/lib/python3.4/threading.py", line 1288, 
> in _shutdown
> [:error] [pid 9181]     assert tlock is not None
> [:error] [pid 9181] AssertionError: 
> [:info] [pid 9181] mod_wsgi (pid=9181): Cleanup interpreter ''.
> [:info] [pid 9181] mod_wsgi (pid=9181): Terminating Python.
> [:error] [pid 9181] Exception ignored in: <module 'threading' from 
> '/usr/lib/python3.4/threading.py'>
> [:error] [pid 9181] Traceback (most recent call last):
> [:error] [pid 9181]   File "/usr/lib/python3.4/threading.py", line 1288, 
> in _shutdown
> [:error] [pid 9181]     assert tlock is not None
> AssertionError: 
>
>
>

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