Indeed, there's a bug after all:
https://winscp.net/tracker/1690
I'm sending you an email with a development version of WinSCP.
https://winscp.net/tracker/1690
I'm sending you an email with a development version of WinSCP.
Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
EDIT: errr... I fixed it, not sure how.
Only variation I had this time, after a clean uninstall+reinstall of 5.13.4, while starting a first transfer, I toggled the checkbox to have it be transferred in background.
I don't know if that's what fixed the issue and quite frankly, I don't have the courage to risk to "unfix" it, I need the program on a daily usage.