Hello,
I can confirm there is an issue with Drag'n Drop. For some reason I couldn't determine, Drag'n Drop suddenly begins to behave weirdly, it doesn't just stop working in what I experience. I think it is related to other discussions titled «Drag'n Drop not working on El Capitan», «Upload to wrong folder» and «Drag'n Drop issue».
• Normal behavior : when dragging a file over a directory, this one passes into a rollover state so that we can drop the file within the directory without having to open the directory.
• Buggy behavior : when dragging a file over a directory, there is no more rollover effect and dropping the file in this situation makes the file «disappear». In fact, it doesn't really disappear, it is copied within a parent directory. I encountered several times the issue and needed to check within the logs in order to know where the file was copied.
• Solution : restart Yummy FTP
I encountered the bug each time I had to rename some directories in a row. It may be related to Yummy FTP having to deal with quite a queue on a not so fast FTP connection, maybe some memory issue?
Regards,
Éric