My Thunderbird beta updated when I opened it this morning. Despite looking everywhere, adjusting what I could, and spending time undoing and redoing settings in an attempt to get the columns to appear in my display, I could not get it to happen. I have no columns and can only display the email list as taller rows, limiting the number of emails listed to less than half of what it used to be. I also cannot click on any button (because they are unavailable) to show an email as read/unread, cannot see the junk mail icon lit up, sort by attachments, date, name, show priority level, etc. I still have the regular version of Thunderbird installed because I know beta can be glitchy. I will use that until I can find a way to display my emails using the columns and not just the rows with limited information. I would love to know how to fix this. I have looked and tried everything I can think of. Any suggestions?