Thunderbird Hangs When Creating Account (accounthub)

I was able to set up my main account when I installed Thunderbird. The app is fully up-to-date. Now, when I try to add any mail account - enter name and E-mail address - screen goes pale and the doughnut icon spins endlessly. CTRL+ALT+DEL to kill the app. Tried in safe mode - still no go. In every other respect, the app works fine. I can access the other accounts via Outlook, so not a huge deal, but would rather do everything in Thunderbird now that I have switched. Don't want to have to reinstall or create a new profile as I have only just set Thunderbird up (about a month ago).