After the last few updates to TB, the calendar fails to show my Google calendars and events. I have to click on the side panel eyeballs to get them to appear every time after I open TB. I have uninstalled and re-installed Google calendar and the Provider for Google Calendar. Does not resolve issue. This is happening on all my Win 10 machines. Win 10 64bit - TB ver = 78.4.3 Please see attached image. Thank you, David Roessler

I don;'t think the image loaded on my first post. Here it is. Sorry if repeat.

The issue is also reported here, where the developer is more likely to see it:

https://github.com/kewisch/gdata-provider/issues/133

Try disable/enable the add-on.

You can add a Google calendar to TB without add-ons, as a CalDAV calendar, by entering this for the Location:

https://apidata.googleusercontent.com/caldav/v2/myname@gmail.com/events

Enter your email address for the Username, and allow cookies in Options/Privacy & Security.