I use FTP Voyager in conjunction with DOpus... And I have had a problem with Dragging and Dropping from the FTP Voyager explorer view to a Directory Opus window (but from Directory Opus to a Windows Explorer window works fine).
I wrote to FTP Voyager (ftpvoyager.com) and they said: "for us to change the way FTP-V handle Drag/Drop would only hurt its compatibility with Windows Explorer".
Anyway, is there any way you can look at this to see why maybe other applications do not drag/drop like Explorer windows when using Directory Opus? Is this something with Directory Opus or should I go back to FTPVoyager?
On a side note, please add remote folders to the left side pane... doing this would allow me to use Directory Opus FTP much more often. I need easy access to both folders and files at the same time when working with multiple files in web development.