Thanks to my colleague Suzanne Sylliaasen for posting the details of the July 2016 Project and Project Server updates covering 2010, 2013 and 2016 - https://blogs.technet.microsoft.com/projectsupport/2016/07/12/project-server-2010-2013-and-2016-july-2016-pu/
Another recent posting on the Project Support site is a workaround for an issue in Project Server 2016 where userviews are missing from the pjrep reporting schema. Project Server 2016- Missing some UserViews- Still tracking down root cause on this one, but it appears it can happen when the updates are applied and the configuration wizard executed – as we drop and re-create the views. In 2016 if you have more than one PWA in a single content database then these views will not be present as we only support accessing the database to report when just a single PWA instance is present per db. Probably got some bad logic that is miss-detecting this condition.