Kmail folder list is bugged in 4.10.1 ; when it's sorted by name desc, it's fine. When it's sorted by name asc, the column titles are replace by "0", and the 'line height' are smaller. Additionally, the 'Sent' folder form local folders where auto-magically added to my favorites, which is wrong, and 2 "ghost" folder with no name and that you can't select are now shown too. Reproducible: Didn't try
Created attachment 77855 [details] Wrong column titles and line height
Created attachment 77856 [details] The other sorted folder list
I closed Kmail, and restarted it, (without restarting akonadi), and the bug is gone. I don't know how to reproduce it.
Close it until we know how to reproduce it