I would suggest be please you have not had 111 inflicted. See https://thunderbird.topicbox.com/groups/beta for beta discussions. Including the fact beta 111 apparently has a lot of broken functionality to do with super nova..

According to my Thunderbird, I am on the Beta update channel. However, I see that version 111 beta has been released. My Thunderird "about" screen says that I am up to date on version 110b4. Why will it not update to 111?

You were "stuck" on 110, because for a few weeks we were still tuning up 111 and had updates disabled.