Several weeks ago when I opened up Thunderbird, a Message would appear on the top of the page that no messages were found. I had to open and close the program several times and could then see my inbox, I discovered that all the messages in my Inbox over about a month old were blank when I opened them up--just a white page with nothing on it. A few days later, it corrected itself. Now it has happened again. I have made no changes to my account, software, computer, etc. that I am aware of. Suggestions? Thank you! I am an elder and not particularly tech savvy.