I've just installed the current build of CoreFTP Lite, and I'm having trouble with drag-and-drop transfers. I'm connecting to my server using FTP over SSL with the OpenSSL library, but I have also seen this issue with several other FTP servers, with and without SSL.
When I try to use the drag-and-drop option to copy a file from my ftp server to a local folder on my desktop, it works fine if there is only one file. However if I select multiple files, CoreFTP Lite will copy the first file, then immediately try to download it again, prompting me to overwrite it. No matter what choice I make, overwrite, skip, rename, etc., the program continues in an endless loop trying to overwrite the first file in the selected bunch of files.
If I cancel the transfer, I either get an "Unable to read from source" error, or CoreFTP locks up and must be killed.
It looks like when you drag-and-drop, the file is first downloaded into your temp dir, then moved to the appropriate location. Something goes wrong somewhere in the process, because the file is still in the temp dir, and has not yet appeared in the final destination folder when I start getting the prompt to overwrite it.