Mendeley Windows MS Word Plugin Issues in Mendeley Desktop and Mendeley Reference Manager.

Many glitches and issues with Mendeley can be solved by completely shutting down the Mendeley Desktop software or Mendeley Reference Manager, and then reopening it. Make sure to do the same for Microsoft Word if you are using the two in tandem.

If you are having an issue with the browser Mendeley, try logging out and logging back in. Alternatively, try logging in from a different web browser.

If this doesn't work, restart your computer and then try the above options again.

Uninstalling and Reinstalling The Microsoft Word Plugin
To fix issues with the Word Plugin, try uninstalling and reinstalling it. Here's how:

Open Mendeley desktop software
Make sure MS Word is completely closed
Go to the “Tools” menu at the top of your screen (on a Mac)
Choose “Uninstall MS Word Plugin”
Close and reopen Mendeley
Go back to “Tools”, select “Install MS Word Plugin”, hit OK
Open MS Word
Check the ‘references’ tab in Word to see if the plugin is working