Od poslednej aktualizácie Thunderbirdu, sa mi prestali zobrazovať vlastné priečinky .

Since that is an IMAP account, my suggestion is to highlight the account in folder pane, rightclick and select 'subscribe' and see if the folders are listed and tick the box. Another area to check would be the 'server settings'' pane for the account and click the 'advanced' button to see what folders are displayed. Other than that, I have no suggestions, but others may. Good luck.