Post a crash ID from Help/More Troubleshooting, Crash Reports. An ID is a string starting with bp-...

In the meantime, run TB in safe mode (hold Shift when launching) and see if it still crashes.

Hi - thanks for that. Think this is the crash ID bp-68b054ac-2b87-4b3a-8292-a964a0211014

Tried safe mode, a TB process starts (visible in Task Manager) but

the application doesn't get as far as opening a window...

Not sure if it's related, but a recent Libre-office update caused Libre to crash - something to do with an issue with certain video cards and a new video feature (can't remember the name, but it was a 4-letter thing starting with S).

Had to drop down to several earlier Libre releases in order to get it working again...

The crash report points to this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1732549

It looks like it will be fixed in the next 91 release, perhaps within a week or two. Avoid setting View/Threads to Unread in the meantime and see if that is stable.

Hi. Thanks for the info. I don't pretend to understand the details in the bug discussion - way above my head <grin>.

As to changing the 'View/Threads to Unread' option - as far as I can see, I need to be able to _select_ the folders in order to change that option - but every time I try to do that, TB crashes.

Right-clicking on the thread doesn't bring up that option..

Can I 'downgrade' my TB to a version which doesn't have this bug - and, if so, where would I find that version, and is it simply a matter of downloading it and installing it?

Thanks for your help so far - appreciate it Adrian

The previous 78 release is here, but it's not as simple as installing it and opening the existing profile. I would advise installing 78 in a separate folder, not running it at the end of setup, opening a Run window (Win+R) and starting Profile Manager by entering <path to TB 78>/thunderbird.exe -p and creating a new profile, then adding a newsgroup account. This will keep the 78 and 91 setups separate, and you can return to 91 when the bug is fixed.

Thanks - had a feeling it might not be straightforward... I'd be in deep trouble were I to do something and mess up my historical emails - so perhaps I'll just forgoe my newsgroup access until the new version of TB comes out...

Thanks! Adrian

If it's just a text newsgroup, consider reading it in Google Groups. If it's a binary attachment group, you probably aren't using TB for that anyway.

No =- plain old text newsgroups <grin> I can live without. I'm guessing that TB will tell me when there's an update available?

Many thanks Adrian

TB should notify, but you can check for updates in Preferences/General/Updates.

Perfect - thanks.

So - just checking - the 'Release Notes' page now shows 91.2.1 as the latest release.

Do you know if this release contains the bug-fix for this 'reading newsgroups' problem?

Many thanks Adrian

It's not in the release notes, but it appears to be fixed in 91.2.1:

https://bugzilla.mozilla.org/show_bug.cgi?id=1732549#c11

Perfect - thanks - I'll download it and have a see... Will report back. Thanks Adrian