Thank you, found it. There is a strange issue, though. Independently from the connection type, when I FIRST double-click on a remote FTP sub-directory the DOpus COPY dialog (!) with no parameters is opened for a short time (see attached image: displayed after clicking on a sub-directory called 'doc'), after that double-clicking on a sub-directory has no effect. But when I click the default (bold) 'Open' context menu item on the sub-directory then it opens normally. It seems the double-click is not passed as an Open command to the FTP server, this may be a bug in DOpus?
Sorry, the copy dialog issue is not a bug, it comes from a script in the DOpus double-click event for folders:
dopusrt /CMD Copy FILE {filepath$} MAKELINK=shortcut TO /Recent
go
I use this script to track the folder history in an other program (RecentX). But why this is not working for FTP sub-directories?
Because you can't create shortcuts to folders on SFTP sites I guess.
The dialog is shown also with a 'Standard connection' (simple FTP), so this should not be the question, IMHO.
Because you can't create shortcuts to folders on FTP sites I guess. At least not using that command.