Just a comment, not a solution: If you're still using the LIghtning addon, I suggest removing and using the default calendar feature in Thunderbird.

Yeah, I guess I am so used to calling it that. No Lightning extension. Sorry I was not accurate.

How do you connect to your Google Calendar? Via Provider add-on? Or via CalDAV?

Via Provider for Google Calendar

Thunderbird supports CalDAV natively. So unless you do need tasks, there is no need for the Provider add-on. To create a CalDAV calendar in Thunderbird: Open the Calendar tab Press Alt or F10 to bring up the main menu bar in case it is hidden. File (Alt-F) - New - Calendar Select 'On the Network' Enter your Gmail email address, and leave the Location field blank. Follow the instructions.

I use tasks.

Are you running the latest version of the Provider add-on? https://addons.thunderbird.net/thunderbird/addon/provider-for-google-calendar/

Yes, latest version of Provider. I actually took Provider out and resubscribed and it worked - until the next day. My computer is fried I think. Ordered a new one. Tried reinstalling Windows but it still doesn't work right. Windows 11 has been nothing but a nightmare pain in the ass ever since I updated. Ran checks on files. Reinstalled. Only ting I did not do has been to wipe the whole thing out. If MS starts charging for the crap they release, I will be done.