In the batch of updates that Microsoft has delivered this month so far, there have been many reported issues. One of those affects Microsoft Word 2016. See: Tracking: KB4011730 Might Break Word 2016.
Microsoft has now admitted to being aware of the issue and is working on a fix. In the interim, the company has provided a workaround that involves installing another update. That update is the March 6, 2018, update for Office 2016 (KB4018295).
According to the support document released for this issue, the problem only affects those copies of Word 2016 that were installed using MSI technology. It does not affect Click-to-Run editions of Office.
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