I selected many files on my ftp server.
I started to "download and delete (F6)" these files to my local disk in the Background (queue1).
This background process was still in progress when I refreshed the ftp directory and selected new files to "download and delete (F6)" (queue2).
Accidently I selected some files from queue1 again so that these files were also in queue2.
When queue2 is processing such an already moved file it displays an error message that it can't open the source file.
Bug: At this time the target file is already overwritten with a zero bytes file.