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strange things happenig

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I am using Thunderbird 115.18.0 and Windows 7 professional (no snarky comments please).

All has been working fine for years, but in the last few days, strange thing have been happening:

In the pane with all of my email accounts, the ">" icon to the left of the first account has been disappearing. This meant I could not look at any folders, including Inbox, Drafts, Sent etc and handmade folders. Cured by closing and opening Thunderbird.

I now have two Archive folders, one called Archive, the other Archives. Both empty, neither can be deleted.

Periodically, when the ">" is present, selecting it (to "V"), the list of folders SLOWLY appears, one folder at a time.

Periodically, the bottom of the Thunderbird window, shows a 'downloading' message, of hundreds of files. Several GB of data has been downloaded over a couple of days.

Opening the Inbox folder, the pane with subject, correspondents, date etc has changed the sort order.

Sometimes, all of the emails in this pane have had their font underlined.

Nothing on my system has intentionally changed,

Any ideas what has gone wrong, and how to put things right would be appreciated.

Thanks,

I am using Thunderbird 115.18.0 and Windows 7 professional (no snarky comments please). All has been working fine for years, but in the last few days, strange thing have been happening: In the pane with all of my email accounts, the ">" icon to the left of the first account has been disappearing. This meant I could not look at any folders, including Inbox, Drafts, Sent etc and handmade folders. Cured by closing and opening Thunderbird. I now have two Archive folders, one called Archive, the other Archives. Both empty, neither can be deleted. Periodically, when the ">" is present, selecting it (to "V"), the list of folders SLOWLY appears, one folder at a time. Periodically, the bottom of the Thunderbird window, shows a 'downloading' message, of hundreds of files. Several GB of data has been downloaded over a couple of days. Opening the Inbox folder, the pane with subject, correspondents, date etc has changed the sort order. Sometimes, all of the emails in this pane have had their font underlined. Nothing on my system has intentionally changed, Any ideas what has gone wrong, and how to put things right would be appreciated. Thanks,

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