Just as a follow-up. My advise for now would be to avoid using Firefox as a browser when working with ListMail.
It's no big deal, just use IE for those interactions with the ListMail application.
The issues I've seen is the "not updating counter" issue mentioned in this e-mail and also when I tried to import new users from a CSV file, it worked, but I did NOT get confirmation (number of users, duplicates and bad address counts). Again - it did work, but the screen did not update - same as when I sent the e-mail.
Many ListMail functions do work, but the critical issues like hanging up when sending will not be good for you as you wonder if the mail went out!
Again, no big deal, but for now I would say that ListMail is currently not Firefox friendly.
Dean, I could try to do some UAT and give you details about what happens and what does not happen if you are interested.
Steve