Last night I had some packet loss on my internet connection while I was downloading some files with WinSCP 3.3.0. While the connection was already closed on the other end, WinSCP never seems to end the active download, it just keeps on showing the useless animations.
Pressing cancel and then yes doesn't do anything, WinSCP just keeps on 'transfering' a file over a non-existing connection. Had to kill it to get it to stop.