<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.1.2

Error message:
External exception C0000006

Trace de la pile :
(01004D12)
(0008239F) ntdll.dll
(0006FEFA) ntdll.dll.KiUserExceptionDispatcher
(01005EAA)
(01002C0C)
(0008239F) ntdll.dll
(0006FEFA) ntdll.dll.KiUserExceptionDispatcher
(005441B0)
(01004455)
(01005A2F)
(00DF1486)
(00DF15EF)
(00E03A6B)
(00E03793)
(00E02C03)
(00E03E04)
(00018711)
(00011F90)
(00012046)
(0001224C)
(0001240B)
(0004D8CD)
(0026344C)

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.