Problem

When working with the Word Add-In and Word 365 one of the following occurs:
  • In the bibliography only the last inserted reference appears.
  • The bibliography appears to disappear if the the table of contents is updated.

Solution

Repair your installation of Office 365. 
  1. Switch to Control Panel > Uninstall a program.
  2. Select Microsoft Office 365 and then click Change
  3. Choose Online Repair and click Repair.