I just upgraded to the latest version of Thunderbird. To my surprise and dismay, where the system used to default to a username as I type it in ... that no longer happens. Further, my groups no longer work. I have a number of Kiwanis groups in different cities to whom I send email blasts . . . I'm no longer able to do that. The system does not recognize my group names. I would have to go in and type each member name within that group . . . which destroys the value of group settings. How to fix? Or is it fixable? It seems that a system that wasn't broken, got fixed . . . and, in the process, broke a very valuable tool. HELP!