Happy New Year all!
Mine has started with Thunderbird repeatedly disappearing from the screen immediately after loading, before there is time to do anything with it. I have been using it since mid-October with no problems until now.
This happens whether I open it from an icon (Desktop configuration file) or from the Celena Start menu.
Should I do a re-install or an update? This is TB which came with Celena, and I have read in this forum that there are dangers with non-mint updates. That's why I am asking in this rather than the TB forum.