First, make sure View/Message Body As is Original HTML, then check Settings/Privacy & Security/Mail Content/Exceptions to see if you're blocking any sources of remote images. If you have a VPN or antivirus is scanning mail, they might also be interfering.

I have gone through all the levels of Account Settings (General; Composition; Privacy & Security) and Thunderbird settings (Server Settings: Copies & Folders; Composition & Addressing) and I was unable to find "Message Body As is Original HTML" nor did I find anything in Exceptions that could possibly block any source of remote images. And as far as I know nothing scanning my mail could be interfering. I've gone through everything in Account Settings and Thunderbird setting with a fine tooth comb several times and can't find a thing.

I also found a new update just before writing this and I did the update and then went through it all again and nothing had changed. This former Help Desk person (in a previous life, now retired) is feeling not so competent.

If you need any explanation images, don't hesitate to ask and I will provide. Thanx for your assistance! I have used Thunderbird for decades. I started using it while it was still part of Firefox and haven't had this much trouble figuring out how to fix it in all that time.

The View menu is on the Menu Bar; press Alt if it's hidden (see picture). Also available from the 3-bar hamburger icon in the upper right corner.

If you've been using the same profile over many versions of TB, there might be some obsolete setting that's thwarting images. Creating a new profile often cures difficult issues.

The view menu bar correctly has original HTML checked.

As I've said I've had the same thing since close to the beginning and have had very few problems. I find it hard to believe that over several decades and major updates that a minor update would blow up my ability to use it.

So as I understand it, to solve this problem for all 6 of my identified emails I will need to create new profiles for each of them? Do I need to delete the old profile before creating the new one or...? Will I need to delete *all* of them before creating new ones? What happens to the emails and user defined folders and sub-folders within the current profiles?

Thanx, Collien~~~

Still not sure if an external app like antivirus or antispam is interfering. If the issue only appeared after an update in the 102 branch (not from 91 to 102), it could be that an external app that's affecting TB has become incompatible when TB updated. Running Windows in safe mode would test this as it bypasses startup apps.

But to test with a new profile, you don't need to delete the current one, and a profile supports multiple accounts. Create a new one from Help/More Troubleshooting, Profiles, about:profiles, add one account that has the issue, and see if the images appear. If they do, you can add the other accounts and also transfer local mail, contacts etc. from the old profile to the new one. Either profile can be launched from about:profiles.

I got caught up in the holiday prep and health issues and didn't get back to fix this. When I did have time, it was solved. This issue had nothing to do with Thunderbird or updates or anything that any of the suggestions would have helped.

I was having an intermittent problem with the Proxy Server turning off and on and when we finally figured that one out and turned off the Proxy Server, it healed my html issue.

PROBLEM SOLVED!

Thanx to everyone that assisted in attempting to solve my issue. You are appreciated!