What is the version of TB and of the add-on for syncing the Google calendar?

I'm on Thunderbird 78.4.0 and the add-on is the Provider for Google Calendar - don't know the version, but there's a thread here saying that Provider is disabled on TB 78.4.0 with a suggestion to re-load it.

I've just re-installed Provider for Calendar, and it's back again! Problem solved

I am having this same problem... I am having it on multiple computers, all with same accounts and settings... I reinstalled the Provider for Calendar plug in on one computer, the other is a new configuration, I installed this plugin on that one and I still don't have the calendar on either system.... Both Computers are running the latest Windows patches (I check updates every Friday - automatically and manually) Both Computers are running Firefox 78.6.0 Please let me know what to do next... I rely on my calendar daily (I have it synced up on my android phone & tablet as well as on multiple Computers.

There is a workaround to this problem which I now use. Go to the list of calendars, and right-click on Home. Select "Show Only Home". Then right-click on "Show All Calendars" and they reappear. It's a nuisance, but it does work (at least for me!)

There is a workaround to this problem which I now use. Go to the list of calendars, and right-click on Home. Select "Show Only Home". Then right-click on "Show All Calendars" and they reappear. It's a nuisance, but it does work (at least for me!)

Thanks, this workaround is helping me with the same issue.

This is RIDICULOUS! It's a known problem - STOP putting it on users to find and fix this EVERY UPDATE!

AND, a Big One. WARN people before installing an update that KILLS plug-ins that I DEPEND ON !@!@!!! All of a sudden things don't work ... I'm trying to do my job ... and I spend hours messing with getting back to a working state. Unacceptable!

Funnily enough, my calendar seems to be working perfectly now. Maybe they've fixed it!