<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 6.3.3

Error message:
Invalid access to memory.

Stack trace:
(00C10759)
(0009823F) ntdll.dll
(00077E51) ntdll.dll.KiUserExceptionDispatcher
(00C10959)
(00C610F0)
(00C6464E)
(00C643E1)
(00C66796)
(00C65E52)
(00AE8163) @TUnixDirView@ReloadDirectory$qqrv
(0001C72A)
(00054FDF)
(00054F9C)
(002271BC)
(000320B1) USER32.dll
(00022EF1) USER32.dll
(000217B0) USER32.dll
(000212FB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

<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 5.6.3

Error message:
External exception EEFFACE

Stack trace:
[758B2F71] KERNELBASE.dll.RaiseException
[779CC84E] ntdll.dll
[779CC6B6] ntdll.dll.KiUserExceptionDispatcher
[01405D70]
[017473D6]
[01748720]
[0172C750]
[0163D5F5]
[0163E968]
[0164E67B]
[01678BD1]
[016776D0]
[015817DC] @TUnixDirView@ReloadDirectory$qqrv
[00FA363E]
[012F1A84]
[010D95E5]
[013949A6] @Tb2item@TTBPopupMenu@IsShortCut$qqrr22Winapi@Messages@TWMKey