Fixing Google Chrome Content Settings
Please review Chrome Settings -> Advanced Settings-> Privacy -> Content Settings
Or open the settings page directly at chrome://settings/content
Simple fix

Un-check Block third-party cookies and site data in Cookies section
When the checkbox is empty, close your Gmail window and open it again.
Advanced method
Select Manage Exceptions at chrome://settings/content

Copy and paste into Hostname: chrome-extension://bnjglocicdkmhmoohhfkfkbbkejdhdgc/

Make sure that Allow is selected, then click Done. Refresh your gmail window.