If you customize the columns in the view of TV episodes, then click "Refresh" in the main menu (upper toolbar) and the GUI reloads, then the columns in the TV episodes view will be reset :(
This does not happen with the Table that shows the movies.
If you have a tv show selected in the treeview, nothing happens.. but if you have the "Movies" or "Movies Database" selected, the GUI will refresh and reset the column for TV view.
This is very annoying, and hopefully should be easy to fix