A blank activity feed can be caused by cookies from Yesware being blocked.
To check this, follow the steps below:
1. Paste this link into a new browser window: chrome://settings/cookies
2. Make sure the option "Clear cookies and site data when you close all windows" is OFF.
3. Under 'Sites that can always use cookies', click Add, then type: [*.]yesware.com
4. Do not check the 'Including third-party cookies on this site'5. Then please refresh your Gmail at the browser level for the changes to take effect.
If these steps do not resolve the blank activity feed, please reach out to Yesware Support.