Copying files to remote side failed - TTerminalManager::OperationProgress

uploading two file to ftp 1Gb

WinSCP 5.9.4

Error message:
Copying files to remote side failed.

Invalid access to memory.

Stack trace:
(003E589C) System::UStrAsg
(00866B5E) C5073_0
(00868BC6) ____ExceptionHandler
(00865980) __ExceptionHandler
(000624F6) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(0008D357) TTerminalManager::OperationProgress
(00773005) TTerminal::DoProgress
(006948FF) TFileOperationProgressType::DoProgress
(0076DB99) TRobustOperationLoop::TryReopen
(0075B7B3) TSFTPFileSystem::SFTPSourceRobust
(0075A90A) TSFTPFileSystem::CopyToRemote
(00787619) TTerminal::CopyToRemote
(0000DCB0) TCustomScpExplorerForm::ExecuteFileOperation
(0001F704) TCustomScpExplorerForm::RemoteFileControlDragDropFileOperation
(0001F890) TCustomScpExplorerForm::RemoteFileControlDDFileOperation
(006559DE) TUnixDirView::PerformItemDragDropOperation
(004085A6) Customdirview::TCustomDirView::DDProcessDropped
(0042CB4B) Dragdrop::TDragDrop::WndMethod
(0037322C) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

(003E589C) System::UStrAsg
(00866B5E) C5073_0
(00868BC6) ____ExceptionHandler
(00865980) __ExceptionHandler
(000624F6) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(0008D357) TTerminalManager::OperationProgress
(00773005) TTerminal::DoProgress
(006948FF) TFileOperationProgressType::DoProgress
(0076DB99) TRobustOperationLoop::TryReopen
(0075B7B3) TSFTPFileSystem::SFTPSourceRobust
(0075A90A) TSFTPFileSystem::

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)>

This happens almost every time I try to upload a large file. Drag&Drop from Windows Explorer.
First crash at 787.463 KB
2nd crash at 1.792.574 KB (I had resumed the upload)


WinSCP 5.9.4

Error message:
Copying files to remote side failed.

Invalid pointer operation

Stack trace:
(003E58AB)
(003E58AB)
(0008D357)
(00773005)
(006948FF)
(0076DB99)
(0075B7B3)
(0075A90A)
(00787619)
(0000DCB0)
(0001F704)
(0001F890)
(006559DE)
(004085A6)
(0042CB4B)
(0037322C)
(0002C2B1) USER32.dll
(0000D885) USER32.dll
(0000D1DF) USER32.dll
(0000CF9B) USER32.dll.DispatchMessageW

(003E36F4)
(003E36F4)
(00866B09)
(008679F7)
(00868A0D)
(00865980)
(00081D3F) ntdll.dll
(00866AEE)
(00868CDA)
(00865980)
(00081D3F) ntdll.dll
(0006F8EA) ntdll.dll.KiUserExceptionDispatcher
(004B928C)
(003E58AB)
(003E58AB)
(0008D357)
(00773005)
(006948FF)
(0076DB99)
(0075B7B3)
(0075A90A)
(00787619)
(0000DCB0)
(0001F704)
(0001F890)
(006559DE)
(004085A6)
(0042CB4B)
(0037322C)
(0002C2B1) USER32.dll
(0000D885) USER32.dll
(0000D1DF) USER32.dll
(0000CF9B) USER32.dll.DispatchMessageW

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.