One by one, emails accounts disappearing from x-notifier drop-down list

over the past five days, one by one, my signed-in gmail accounts have all vanished from the drop down list of X notifier.
When I went to settings, or "Dashboard" I found all my gmail accounts were greyed out.

Has X notifier stopped working with Gmail or Chrome? 

My computer:

Chrome Version 87.0.4280.88 (Official Build) (64-bit)
Windows 10 pro

Please help!