Attempting to edit a title with more than 15 authors (whether increasing the number of authors beyond 15 or editing some other part of an existing title having more than 15 authors), or trying to make a new variant title with more than 15 authors causes a Python exception in titleClass.py. This can be reproduced by making a new parent title with more than 15 authors, by editing title data and adding more authors to exceed 15, or creating a pub with more than 15 authors and then editing the subsequent title data (add a note, say).
Anonymous
This behavior was also true of interview/review subjects.
This is fixed by the 2-Sep-2009 commit of titleClass.py (1.3). Changed the handling of title_authors and title_subauthors from using fixed, 15-entry arrays to using dynamic arrays instead. This allows an arbitrary number of authors and/or *view subjects.
Pubs and awards had the same problem and were fixed in common/awardClass.py 1.2 and common/pubClass.py 1.6. Implemented in r2009-27.