Invalid access to memory - TCustomScpExplorerForm::CMDpiChanged

Transferred a number of files as routine.
Alt-tab away for some time.
Alt-tab back and error was reported.

WinSCP 5.17.6

Error message:
Invalid access to memory.

Stack trace:
(000280D8) TCustomScpExplorerForm::CMDpiChanged
(0008421F) ntdll.dll
(00071B21) ntdll.dll.KiUserExceptionDispatcher
(00279E65) Vcl::Controls::TWinControl::WndProc
(0023432C) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.

Open WinSCP
"New connection" to open a existing saved profile.
Select + Copy 12 files in background.
Used F6 to copy/delete 6 files and F5 to just copy other 6.
Click "close session" icon.
WinSCP gave memory error.

WinSCP 5.17.6

Error message:
Invalid access to memory.

Stack trace:
(000280D8) TCustomScpExplorerForm::CMDpiChanged
(0008421F) ntdll.dll
(00071B21) ntdll.dll.KiUserExceptionDispatcher
(00279E65) Vcl::Controls::TWinControl::WndProc
(0023432C) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.

<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 5.17.10

Error message:
Invalid access to memory.

Stack trace:
(0002812C) TCustomScpExplorerForm::CMDpiChanged
(0008627F) ntdll.dll
(00072C01) ntdll.dll.KiUserExceptionDispatcher
(0027AD15) Vcl::Controls::TWinControl::WndProc
(002351DC) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.

<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 5.17.10

Error message:
Invalid access to memory.

Stack trace:
(0002812C) TCustomScpExplorerForm::CMDpiChanged
(0008627F) ntdll.dll
(00072C01) ntdll.dll.KiUserExceptionDispatcher
(0027AD15) Vcl::Controls::TWinControl::WndProc
(002351DC) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.

<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 5.17.10

Error message:
Invalid access to memory.

Stack trace:
(0002812C) TCustomScpExplorerForm::CMDpiChanged
(0008771F) ntdll.dll
(000740A1) ntdll.dll.KiUserExceptionDispatcher
(0027AD15) Vcl::Controls::TWinControl::WndProc
(002351DC) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.

<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 5.17.10

Error message:
Invalid access to memory.

Stack trace:
(0002812C) TCustomScpExplorerForm::CMDpiChanged
(0008771F) ntdll.dll
(000740A1) ntdll.dll.KiUserExceptionDispatcher
(0027AD15) Vcl::Controls::TWinControl::WndProc
(002351DC) Vcl::Forms::TCustomForm::WndProc

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

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