Sounds like what we are seeing caused by the Calendar addon.

For Windows, 1. install older version from http://releases.mozilla.org/pub/mozilla.org/thunderbird/releases/38.2.0/win32/en-US/Thunderbird%20Setup%2038.2.0.exe 2. remove calendar addon, restart thunderbird 3. update thunderbird at help | About 4. reinstall calendar addon

Does that help?

I'm not sure I did everything correctly. (couldn't find "update" in help.)

Muddled thru however, and everything seems ok.

Mucho thanks for your help,

Bob

after disabling add-ons (making it permanent or not) , continuing in safe mode is the only way the emails can be seen.

Any clues ?

Thx, Bob

Thanks for that info.

So, in addons, REMOVE the calendar addon, restart normally. Is it better?

And were you using the calendar addon? If you were, reinstall it from tools | addons | get addons. still good?

cannot find add ons to see whats activated, Same question would be how to delete add ons. As far as I know, I'm not using add ons,

Thx, Bob

Ok. So instead please reinstall from getthunderbird.com. This changes your program not your data

Now at 38.3 No change w/problems. Still only runs in Safe Mode

Bob

1. On the toolbar then 
2. Select extensions on the left of the screen. Now all your add-ons should be listed.

Anyone also encounter this problem when updating to Thunderbird 38.4.0?