After upgrading to 4.1.11, in the Email tab, only the inbox folder is listed in the left pane.
When clicking on "Subscribe to folders", the folders do appear in the popup tree view, but still not in the left pane of the main view.
Tried 4.1.13 with same result.
Tried various values (nothing, INBOX, INBOX.) for the root folder setting.
Email are stored on an Cyrus IMAP server.