When loading news and events change list in admin /admin/news_and_events/event/ django raises following Exception:
Exception Type: TypeError
Exception Value: 'unicode' object is not callable
...env\lib\site-packages\treeadmin\admin.py in indented_short_title
r += item.short_title()
It seems that treeadmin is expecting callable for short_title and in arkestra models short_title is unicode.
Ah sorry on one computer I have installed form your fork, but on the other form the piquadrat's. Now it works.