Thks for response. Version is 0.9.3. Don't think I have any plugins; no error msgs seen. If this is not latest version and I download latest ver, do I risk losing address book?
I did find a workaround by changing composing preferences to compose in a new window. With that checked, am able to compose and send mail. If I uncheck that box, Compose function will again self close making it impossible to create mail.