<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 5.7.5

Error message:
Invalid access to memory.

Stack trace:
(007E3466)
(0005A426) ntdll.dll
(0000F12E) ntdll.dll.KiUserExceptionDispatcher
(006734E7)
(00007153)
(0000C575)
(0000CFA8)
(0000D02F)
(0003228A)
(003822E4)
(00169E45)
(0034021C)
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.