When I tried to edit an existing site in the login window, ctl+z will cause WinSCP crash. In my laptop, this is 100% happening.
I am running WinSCP in Windows 7 professional.
WinSCP: Version 5.9.3(build 7136)
Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.