Thunderbird on MacBook updated last night and now no messages are displayed for any folders

I have many folders for 2 POP accounts. This morning everything looked ok. I quit Thunderbird after it had been running unclosed for a week. Came back home, opened Thunderbird, and there are no messages in any folders. My folder pane looks good. I can email from one POP account to another, Get Messages, and see that I have a new message in the other Inbox because the InBox icon changes. But click on that folder or any folder and there are no messages displayed. I looked in all the directories and the box files are all there and the correct size. Go to the bottom of that Inbox file and there is the new test message I just did. One other thing Thunderbird version 115.8.0, MacOS 11.7.10, and there is a SuperNova symbol that I do not remember seeing before. Thanks