Invalid access to memory

The problem happens every time I try to drag and drop files from S3 cloud to local disk.
Downloading via F5 works normally, troubles only with drag-n-drop.

WinSCP 6.6.2

Error message:
Invalid access to memory.

Stack trace:
(000000000002DF3F)
(000000000013C0A7)
(000000000013CDAB)
(0000000000C80E2A)
(0000000000162D6F) ntdll.dll
(000000000001E358) ntdll.dll
(00000000001626AE) ntdll.dll.KiUserExceptionDispatcher
(000000000002DF3F)
(00000000000548E9)
(00000000004D96FB)
(00000000009B676D)
(00000000004D48D5)
(0000000000115A95)
(00000000003937C0)
(000000000039AC80)
(00000000003F8FC7)
(00000000003932B2)
(000000000039AE5E)
(000000000039C06B)
(0000000000115A95)
(00000000003937C0)
(000000000039AC80)
(0000000000399D9C)
(00000000001BDE46)
(0000000000014801) USER32.dll
(000000000001409C) USER32.dll
(00000000000452C3) USER32.dll
(0000000000162654) ntdll.dll.KiUserCallbackDispatcher
(0000000000000334) win32u.dll.NtUserMessageCall
(0000000000013C82) USER32.dll
(00000000000138D4) USER32.dll
(00000000000136BF) USER32.dll.SendMessageW
(0000000000011FFA) COMCTL32.DLL
(0000000000039F60) COMCTL32.DLL
(0000000000075E3F) COMCTL32.DLL
(0000000000074AEE) COMCTL32.DLL
(0000000000014801) USER32.dll
(00000000000142DC) USER32.dll.CallWindowProcW
(000000000039ADF1)
(0000000000394084)
(00000000003FAB85)
(00000000004C891A)
(00000000004D6B05)
(0000000000115A95)
(00000000003937C0)
(000000000039AC80)
(00000000003F8FC7)
(0000000000399D9C)
(00000000001BDE46)
(0000000000014801) USER32.dll
(00000000000142DC) USER32.dll.CallWindowProcW
(0000000000023D78) COMCTL32.DLL
(0000000000023A74) COMCTL32.DLL
(0000000000023D78) COMCTL32.DLL
(0000000000023B4F) COMCTL32.DLL
(0000000000014801) USER32.dll
(00000000000142DC) USER32.dll.CallWindowProcW
(00000000004FC5A9)
(00000000001BDE46)
(0000000000014801) USER32.dll
(000000000001234D) USER32.dll
(0000000000484013)
(0000000000484088)
(00000000004844DF)
(00000000000F7573)
(00000000000F9E61)
(0000000000C7C1F8)

Status: not_matched

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.

@pcdth: 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.