"List of contributors" empty after upgrading to OJS 3.2

Since upgrading OJS to 3.2.1.2, the contributor list for all articles (published and unpublished) is now blank. While this can be manually corrected for the yet-to-be-published articles, the metadata for the published articles cannot be edited (short of versioning). Any advice as to how this has happened and how I can remedy it would be appreciated.