I have just rec'd the following message Pop-up titled "Provider for Google Calendar" The quota for kelleywillis@earthlink.net has been exceeded, please try again later. [OK]

Don't know what THAT means, but it reminded me that I was asked for the calendar logon by Thunderbird a few days ago. I gave it a logon. Not sure if it was the right one. I must have one for each of the 5+ email accounts I have. So maybe that's why this is so locked down. But I cant get anywhere on Thunderbird with all the menus ignoring my clicks. I'll try again in a few hours, see if anything changed

Two simple diagnostic steps: see if TB runs properly in safe mode (hold Shift when you launch TB), and run Windows in safe mode, and then run TB in normal or safe mode. Windows safe mode will test if there is a startup app, such as security or AV, causing TB to fail.

Thanks for the response. I'm away from the PC til this evening, and am not sure about rebooting into safe mode while remoting into it. I will test that when I get home. I DID test Tbird in Safe Mode, in it now, seems to run OK. I tried to post a message anda jpeg of the two calendar messages that seem to be rotating, preventing me from even getting a clear shot to the Tbird window. But the Upload spinner was still going this morning, 10 hrs later. Will try again here, starting with a repeat of that message from last night, here: "Here I am, 4 hours later, and I turn on my screen, to Thunderbird or Google Calendar, showing event after event flickering by. 4 hours ago, in frustration, I opened _A_ calendar (not sure if it was the one I logged into when Thunderbird asked last week) and I just started deleting events. Many of them are old repeaters I just ignore anyway. I just tabbed back over to see if the calendar items are still flashing, and I'd gotten another "quota exceeded" from Google Calendar.

I'll post two screen shots. Maybe I'll just delete my calendars, ALL my calendars, and start again."

NOW: I have gone to Google, logged onto that calendar and done a 'Remove Calendar'. Not sure if that deletes the calendar itself, or just all the events on it.

Here's that jpeg of the messages. Looks like it'll work this time.

OK, I used Task Manager to (again) kill both TBird and the messages notice (two different 'applications' in Task Mgr.

Restarted TBird, when asked for that password for the account don't have access to anymore, I said OK instead of Cancel. It came back Password Not Found (I think. Doing this from memory.) Then TBird acted OK. Took the opportunity to Remove that account from the app entirely.

So not sure if the fix was deleting that Calendar, or was that change in response to the account password prompt.

Whichever, this was an ugly alley to suddenly find myself in. Hope these posts can prevent it, or at least bail someone else out of something similar.

Persistence and posting to help sites, that's what fixes s/w problems.

Thanks for the response. Always been useful to read these threads.

Last note: The example Calendar notice in my JPEG was one of several repeating events. The one from the screen shot is dated 2010. Other different events were from 2012, 2016, 2018. Flickering by so fast I couldn't really tell if the dates were changing for each iteration of each event, or if it was just flashing the events as it found them is some recent range, but showed the date the event was originally set up.

>whew<

If it ran OK in safe mode, the Provider calendar add-on would have been disabled, so it may be worth seeing if you have the correct version of the add-on to match your version of TB.

I think that instead of deleting a network calendar from TB, the correct step is to unsubscribe from the calendar, which maintains it on the calendar provider's site.

Thanks for the follow-up. Checked the Lightning extension, says I'm uptodate. Got it set to automatic updates. I realize I misread your post and tested Firefox in safe mode (Mozilla product, thought a similar foundation/library set might be being checked). My mistake. I agree, now that I've thought it through some more, that, once successfully in safe mode, unsubscribing rather than moving items from the calendar would have been a more desirable next step. If it didn't work, _then_ I would attack the calendar head-on as the next approach.

Lesson: I need to be more observant about calendar maintenance and subscription across all the platforms (iOS, Mozilla, MS Office) that are using this feature, starting with deciding whether one will do. And if not, keeping multiples straight as far as which platform subscribes to which.