Windows 10 Pro, Thunderbird v. 102.2.2 (32-bit) updated on 9/9/22 1) Reminder windows persist after I dismiss all (which I responded that I have that problem too, in one of the posts). 2) My current September month looked suspiciously empty. It appears, based on my Google calendar in the browser on my laptop, and my Android calendar app, that from May (which is missing a few) and then at least June to September, many of my calendar entries have disappeared. If I counted correctly, this is how it looks (if a repeating event spanned several days in a row, I counted it as 1): May: TB 23 non-repeating events, 2 repeating from prior entries; Google 30 nr, 4 r June: TB 4 nr, 1 r; Google 18 nr, 4 r July: TB 0 nr, 4 r; Google 22 nr, 8 r Aug: TB 1 nr, 5 r; Google 30 nr, 7 r Sept: TB 2 nr, 3 r; Google 16 nr, 10 r Oct: TB 4 nr, 3 r; Google 2 nr, 19 r My calendar has been connected to Google since whenever was the last time I had to recreate the connection/whenever Thunderbird started updating the calendar at the same time, rather than having to update Lightning separately. Most of the time, I make entries in the TB calendar on my laptop. Once in a while I do it in the laptop browser in Google, if I don't have TB open. And once a month I enter a specific event on my phone in the Android app (also connected to Google), when I'm not at home. I tried Synchronize in TB, and Troubleshoot Mode, disabling any extensions, and Clearing the Startup Cache, with no difference. Edit: The TB location says: https://apidata.googleusercontent.com/caldav/v2/myname%40gmail.com/events/