More SIRSI sites that don't work:
University of Toronto: http://toroprod.library.utoronto.ca/ (possibly separate issue, only search results are broken, see ticket #1312)
Pennsylvania State University: http://cat.libraries.psu.edu/ (nothing works, see ticket #1327 for local contact info)
And using a new version, SIRSI Dynix, Symphony 3.3.1 (reported at http://forums.zotero.org/discussion/13093/):
Indiana University: http://www.iucat.iu.edu/
Mississippi State: http://catalog.library.msstate.edu/
In light of the rising number of unsupported sites, I'm going to bump up the priority of this and see what I can do to address the issue.