Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.

I have to recreate all of my lists. I'm spitting nails over this. If there was a way to revert to the old 52.x I would.

This did not solve the problem. The upgrade was at fault, not the extensions. Now I have to rebuild the extensions as well as all of my lists. Did you know that if you click on the "solved problem' box there is not way to choose yes or no? So that doesn't even work here in the community support.

In doing this I also ended up deleting emails while deleting the names in the corrupted file which shouldn't have been on the separate lists.

This is the last time I ever upgrade Tbird. I do not have time for this as an editor of two publications and a writer for three.

It saddens me that users have to be the damned computer gurus to get anything done. I've spent 2 hours last night fixing other upgraded software. NOT MY DAMNED JOB.

YOU ALL NEED TO DO MORE TESTING BEFORE SUBMITTING An upgrade!@#$%^&*()

Not my job either. I really do not know who you are addressing your comments to, but they are wasted on me.

This forum get a lot of people with issues, Thunderbird 60 has been released and you are the only person I have seen either here or in Bugzilla complaining or even mentioning they had some sort of issue with address lists. That leads me to be looking in the box on your desk for the issue, not Thunderbird for a bug. But your opinion is obviously something different.

So either you want to work on what is the problem, before you make it worse fixing it. Or you do not. I am assuming you do not. Goodbye.

During the course of this year I've bounced between development, beta and release builds hundreds of times. This has been the best tested thunderbird in a decade.

If you want help here, don't shoot the messenger, and supply the information that is requested.

For my own curiosity I checked bugzilla and no bugs with activity in the past year that match even remotely the description here https://mzl.la/2Qz5MHS

It's clear you have a problem. People can help if you let them.

Thanks so very much for your concern. I was able to get the list back in order using our MS Access data for membership.

All of my 'lists' in back up need serious attention it appears. I have six address books, and lots of lists. After our house was broken into and all electronics were taken along with backup drive, I've been struggling with older backups. I suspect in the transfer things got pretty messy.

In this case when I reset the list, it became the book, not the list, so sending "to" using the book didn't work. I moved the list to a 'list' which worked (not sure where it resides though, as I don't see it under the book.)

Personally I prefer the book to the list.

Lists don't hide addresses so do not offer that benefit of automatically sending blind.

Individual address books can be synchronized with providers like google and outlook as well as ladap servers. While these things purport to synchronize lists it is not as transparent as it should be, nor is it entirely painless often. List make it hard to see who who you are mailing. address books make that obvious. Address books can be used in filters to route mail in Thunderbird, lists can not.

While you can type a list name into the address of an email, I find it almost as easy to select the entire address book listed in the contact pane in the composer (select one address then press Ctrl+A) the select add to BCC. I can also fine tune the address book list by holding the Ctrl key and deselecting a couple of items from the list with my mouse before I add them, I need an add-on to do that with an address list.