Jimm,
please check these stories. I did an "update epub always" on my library and got the following errors:
list index out of range:
http://archiveofourown.org/works/237304
cannot concatenate 'str' and 'NoneType' objects:
http://archiveofourown.org/works/321363
http://archiveofourown.org/works/163104
'NoneType' object has no attribute 'find':
http://www.squidge.org/peja/cgi-bin/....php?sid=35760
http://www.squidge.org/peja/cgi-bin/....php?sid=47146