I was not able to reproduce error that you've described. Can you write me on which Windows version did it happen? Please also write me exact steps that you made. Thank you.

It appears that when dragging files from remote directory to local directory when in explorer interface mode, if the current directory displayed in the local window is changed, the transferred file is not transfered to the intended directory. Apparently it is not copied into place at all, and is instead purged??

Nice work, winscp is great, and needed, too!