WinSCP was connected to a remote host, but the local machine had been closed down overnight (Sleep, rather than Shutdown), severing the session. Resumed the local machine this morning, WinSCP brought up reconnection dialog in the background. Eventually got round to needing to use it after about 45 minutes - normally what happens is the first time you enter the password in this situation, it fails, because the login challenge-response has been open too long and has gone stale. This was indeed the case here, and it failed first time. I then hit (R) to reconnect, entered the password again, clicked to connect and received this error. Normally, it would connect on the second try here without issues.
Invalid access to memory.
The problem happens rarely. I cannot reproduce it.
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