I've just updated Cyberduck to 4.3 version (from the Mac appStore)
I regularly synchronize a folder between my Mac and a remote FTP server.
After upgrading to Cyberduck 4.3, I relaunched my folder sync...
The firts thing I noticed is that the sync has been redone as it had never been done (instead of only pdating the synchronisation between the folder on my Mac and the one on the remote ftp server)
The second thing I think is a real bug... as you'll see on the screenshots, when a file on the ftp server includes accentuated characters (é, è, à, ...that we often use in french) in its name, when copied on my Mac, the accentuated characters are replaced by a question mark...
Then I've noticed that in the folder on my Mac, the file containing accentuated characters are duplicated.
One with the correct accentuated character (copied on a previous synchronisation with a previous version of Cyberduck), and one created today with Cyberduck 4.3 with a question mark replacing the accentuated character. (see screenshots)