Behaviour of "recent files" appears to have changed dramatically with the latest release. The list is empty since the update, and the "Recent Files" Windows refers to a login, but provides no mechanism for login. You are mucking around with the workflow of your users. Why would you make these changes?
I'm having the same issue. If I shut down my mac and then boot it up the next day, all the MS Office apps (Word, PowerPoint, and Excel) have a blank space where recent files are listed and there doesn't seem to be any way to manage this through preferences or options. I am wondering if it's because the office suite is only remembering files saved on OneDrive and any recent files saved on the HD are ignored and forgotten.
Either way, this is a really annoying 'feature' to build into the software. Please fix it ASAP.