I am using Thunderbird 38.2.0 Win 7, computer runs well.

First thanks for any help you can offer. The problem. I am using Thunderbird 38.2.0 Win 7, computer runs well. For about the last six months my Thunderbird has had a very unusual problem, I have spent hours looking for a solution here and have seen nothing like it. There are 5 email accounts linked to this install. It ran flawlessly for years. One day for no known reason the main inbox no longer displayed messages. All of the other folders on that account work fine, as do all of the others folders on all of the other accounts. The emails are there...if I click on the (Now) blank message box, all messages will display in the message view box, but the actual folder contents are blank. I hope I have explained myself clearly. All suggestions welcome. I have created new profiles, reinstalled tbird....at my wits end with this, any help gratefully accepted. Attached is a screen shot of my main inbox folder, as you can see the messages display, but the folder does not show the messages.