Any attempt to Duplicate a file produces errors. Happens every time. Here are test results from two hosting services, Pair and BlueHost. Using Cyberduck Version 4.3.1 (11010) on MacOS X 10.8.4.

At Pair.com:

FTP Error: Cannot copy (filename)
200 Type okay.

Upon hitting "Cancel", the entire file listing for that directory disappears, as though all files have been deleted, and the listing is not visible again until a new browser is opened.

The Log Drawer is empty.

At BlueHost:

Error message is

FTP Error: Cannot copy (filename).
200 TYPE is now 8-bit binary.

Then the file listing disappears.

Log Drawer:

220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
220-You are user number 1 of 1000 allowed.
220-Local time is now 17:41. Server port: 21.
220-This is a private system - No anonymous login
220-IPv6 connections are also welcome on this server.
220 You will be disconnected after 15 minutes of inactivity.
FEAT
211-Extensions supported:
 EPRT
 IDLE
 MDTM
 SIZE
 MFMT
 REST STREAM
 MLST type*;size*;sizd*;modify*;UNIX.mode*;UNIX.uid*;UNIX.gid*;unique*;
 MLSD
 AUTH TLS
 PBSZ
 PROT
 ESTA
 PASV
 EPSV
 SPSV
 ESTP
211 End.
USER countyfr
331 User countyfr OK. Password required
PASS ********
230 OK. Current restricted directory is /
PWD
257 "/" is your current location
NOOP
200 Zzz...
SYST
215 UNIX Type: L8
STAT /
213-STAT
drwx--x---   15 countyfr   12               4096 Oct  7 11:36 .
drwx--x---   15 countyfr   12               4096 Oct  7 11:36 ..
-rw-r--r--    1 countyfr   countyfr           18 Feb 21  2013 .bash_logout
-rw-r--r--    1 countyfr   countyfr          191 Jun 24  2003 .bash_profile
-rw-r--r--    1 countyfr   countyfr          175 May 22  2012 .bashrc
-rw-------    1 countyfr   countyfr           31 Jun 13 16:18 .contactemail
drwx------    5 countyfr   countyfr         4096 Oct  7 11:31 .cpanel
drwxr-xr-x    2 countyfr   countyfr         4096 Jan 22  2012 .cpanel-datastore
-rw-r--r--    1 countyfr   countyfr          500 Feb 27  2012 .emacs
-rw-r--r--    1 countyfr   countyfr          127 Jun 13 16:18 .gemrc
drwxr-xr-x    2 countyfr   countyfr         4096 Jun 13 16:18 .htpasswds
-rw-r--r--    1 countyfr   countyfr          121 Apr 17 03:53 .kshrc
-rw-------    1 countyfr   countyfr           13 Jun 13 20:59 .lastlogin
drwx------    2 countyfr   countyfr         4096 Sep 30 22:54 .sqmailattach
drwx------    2 countyfr   countyfr         4096 Sep 30 22:54 .sqmaildata
drwx------    2 countyfr   countyfr         4096 Jun 13 16:46 .trash
-rw-r--r--    1 countyfr   countyfr          658 Jun 22  2012 .zshrc
drwxr-xr-x    3 countyfr   countyfr         4096 Sep 20 15:30 BackupNow
lrwxrwxrwx    1 countyfr   countyfr           34 Jun 13 16:22 access-logs -> /usr/local/apache/domlogs/countyfr
drwxr-x---    4 countyfr   12               4096 Sep 30 21:57 etc
drwxr-x--x   10 countyfr   countyfr         4096 Oct  7 11:28 mail
drwxr-xr-x    2 countyfr   countyfr         4096 Sep 21 00:20 perl5
drwx------    3 countyfr   countyfr         4096 Jun 13 16:18 public_ftp
drwxr-xr-x   10 countyfr   countyfr         4096 Oct  4 08:13 public_html
drwxr-xr-x   10 countyfr   countyfr         4096 Oct 12 07:07 tmp
-rw-r--r--    1 countyfr   countyfr        24106 Aug 29  2012 webalizer.conf
lrwxrwxrwx    1 countyfr   countyfr           11 Jun 13 16:18 www -> public_html
213 End.
CWD /access-logs
250 OK. Current directory is /access-logs
CWD /www
250 OK. Current directory is /www
NOOP
200 Zzz...
NOOP
200 Zzz...
TYPE I
200 TYPE is now 8-bit binary
PASV
227 Entering Passive Mode (66,147,242,158,150,196)
RETR /webalizer.conf
150-Accepted data connection
150 23.5 kbytes to download
TYPE I
226-File successfully transferred
226 0.031 seconds (measured here), 0.74 Mbytes per second
PASV
200 TYPE is now 8-bit binary
ABOR
227 Entering Passive Mode (66,147,242,158,45,233)
NOOP
226 Since you see this ABOR must've succeeded
STAT /
200 Zzz...
CWD /
213-STAT
drwx--x---   15 countyfr   12               4096 Oct  7 11:36 .
drwx--x---   15 countyfr   12               4096 Oct  7 11:36 ..
-rw-r--r--    1 countyfr   countyfr           18 Feb 21  2013 .bash_logout
-rw-r--r--    1 countyfr   countyfr          191 Jun 24  2003 .bash_profile
-rw-r--r--    1 countyfr   countyfr          175 May 22  2012 .bashrc
-rw-------    1 countyfr   countyfr           31 Jun 13 16:18 .contactemail
drwx------    5 countyfr   countyfr         4096 Oct  7 11:31 .cpanel
drwxr-xr-x    2 countyfr   countyfr         4096 Jan 22  2012 .cpanel-datastore
-rw-r--r--    1 countyfr   countyfr          500 Feb 27  2012 .emacs
-rw-r--r--    1 countyfr   countyfr          127 Jun 13 16:18 .gemrc
drwxr-xr-x    2 countyfr   countyfr         4096 Jun 13 16:18 .htpasswds
-rw-r--r--    1 countyfr   countyfr          121 Apr 17 03:53 .kshrc
-rw-------    1 countyfr   countyfr           13 Jun 13 20:59 .lastlogin
drwx------    2 countyfr   countyfr         4096 Sep 30 22:54 .sqmailattach
drwx------    2 countyfr   countyfr         4096 Sep 30 22:54 .sqmaildata
drwx------    2 countyfr   countyfr         4096 Jun 13 16:46 .trash
-rw-r--r--    1 countyfr   countyfr          658 Jun 22  2012 .zshrc
drwxr-xr-x    3 countyfr   countyfr         4096 Sep 20 15:30 BackupNow
lrwxrwxrwx    1 countyfr   countyfr           34 Jun 13 16:22 access-logs -> /usr/local/apache/domlogs/countyfr
drwxr-x---    4 countyfr   12               4096 Sep 30 21:57 etc
drwxr-x--x   10 countyfr   countyfr         4096 Oct  7 11:28 mail
drwxr-xr-x    2 countyfr   countyfr         4096 Sep 21 00:20 perl5
drwx------    3 countyfr   countyfr         4096 Jun 13 16:18 public_ftp
drwxr-xr-x   10 countyfr   countyfr         4096 Oct  4 08:13 public_html
drwxr-xr-x   10 countyfr   countyfr         4096 Oct 12 07:07 tmp
-rw-r--r--    1 countyfr   countyfr        24106 Aug 29  2012 webalizer.conf
lrwxrwxrwx    1 countyfr   countyfr           11 Jun 13 16:18 www -> public_html
213 End.
TYPE A
250 OK. Current directory is /
PASV
200 TYPE is now ASCII