I just upgraded to Mailman 2.1.16 and python 2.7 (I was still on MM 2.1.11 with python 2.3)
=> with a topics-enabled list, I had a few shunted files with this message :
Nov 14 11:04:29 2013 (21875) Uncaught runner exception: change_header() got an unexpected keyword argument 'Delete'
File "/var/local/mailman/Mailman/Handlers/Tagger.py", line 74, in process
mlist, msg, msgdata, Delete=False)
so I modified this:
on line 74, use delete=False, instead of Delete=False