If I leave the WinSCP window open in the session and disconnect/reconnect at a later time the WinSCP gui has died with only window boundary showing and not operable. Terminating app in Task Manager is only way out. It dies in idle or transferring files state.
If I minimise WinSCP before disconnecting from the RDP session I can maximise it on return and it is still working. It works this way in idle or transferring files state.