@robert.zega: 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.

<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 6.5.4

Error message:
Invalid access to memory.

Stack trace:
(00D37A5B) TTerminal::PeekCurrentDirectory
(000826CF) ntdll.dll
(0007022A) ntdll.dll.KiUserExceptionDispatcher
(00023A40) TCustomScpExplorerForm::UpdateSessionData
(000239AB) TCustomScpExplorerForm::UpdateSession
(0002338F) TCustomScpExplorerForm::DoCollectWorkspace
(0002FF24) TCustomScpExplorerForm::FormClose
(004A6B77) Vcl::Forms::TCustomForm::DoClose
(0002D5AE) TCustomScpExplorerForm::Dispatch
(0039E3C2) Vcl::Controls::TControl::WndProc
(003A356D) Vcl::Controls::TWinControl::WndProc
(004A77B4) Vcl::Forms::TCustomForm::WndProc
(00E06D03) Vclcommon::C4884_0
(003A2A78) Vcl::Controls::TWinControl::MainWndProc
(00204C90) System::Classes::_18364
(0002C2D1) USER32.dll
(0000C305) USER32.dll
(0000BF2B) USER32.dll
(00016E47) USER32.dll
(00070204) ntdll.dll.KiUserCallbackDispatcher
(0000D386) USER32.dll
(0003243C) UXTHEME.DLL
(000321C0) UXTHEME.DLL
(00025BA5) UXTHEME.DLL
(000255D3) UXTHEME.DLL
(0000D611) USER32.dll
(0002C2D1) USER32.dll
(0000C305) USER32.dll
(0000B992) USER32.dll.CallWindowProcW
(003A3675) Vcl::Controls::TWinControl::DefaultHandler
(004AB1FD) Vcl::Forms::TCustomForm::WMSysCommand
(0039E3C2) Vcl::Controls::TControl::WndProc
(003A356D) Vcl::Controls::TWinControl::WndProc
(004A77B4) Vcl::Forms::TCustomForm::WndProc
(00E06C23) Vclcommon::C4884_0
(003A2A78) Vcl::Controls::TWinControl::MainWndProc
(00204C90) System::Classes::_18364%0

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.

@charles.anres: 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.

I access through Open VPN my distant Ubuntu Server.
I cannot access with the usual logon, when I try to open anther link with another user, the pb. occurs. I have tried to uninstall WinSCP and reinstall, no change (It seems desinstall does not fully remove WinSCP ini or config data).
Kind Regards,
Charles.
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.3.5

Error message:
Accès mémoire invalide.

Trace de la pile :
(00C64C2F) TTerminal::PeekCurrentDirectory
(00098D8F) ntdll.dll
(000781B1) ntdll.dll.KiUserExceptionDispatcher
(00022E08) TCustomScpExplorerForm::UpdateSessionData
(00022D73) TCustomScpExplorerForm::UpdateSession
(000089BC) TCustomScpExplorerForm::SessionChanging
(000C29CD) TTerminalManager::UpdateScpExplorer
(000C2B11) TTerminalManager::DoSetActiveSession
(000C2A48) TTerminalManager::SetActiveSession
(000568B6) TNonVisualDataModule::SessionItemClick
(00226F2C) System::Classes::_18201
(00032161) USER32.dll
(00022F51) USER32.dll
(00021810) USER32.dll
(0002135B) 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.

@apl: 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.

<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:
Nieprawidłowy dostęp do pamięci.

Stack trace:
(00C62ED3) TTerminal::PeekCurrentDirectory
(00087B9F) ntdll.dll
(00074121) ntdll.dll.KiUserExceptionDispatcher
(00022E08) TCustomScpExplorerForm::UpdateSessionData
(00022D73) TCustomScpExplorerForm::UpdateSession
(00022757) TCustomScpExplorerForm::DoCollectWorkspace
(0002F19C) TCustomScpExplorerForm::FormClose
(003C2ECB) Vcl::Forms::TCustomForm::DoClose
(0002C8E4) TCustomScpExplorerForm::Dispatch
(00404951) Vcl::Controls::TControl::WndProc
(00409495) Vcl::Controls::TWinControl::WndProc
(003C39A4) 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.

<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 6.1.2

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(00DFCFAF) TTerminal::PeekCurrentDirectory
(00087A7F) ntdll.dll
(000740D1) ntdll.dll.KiUserExceptionDispatcher
(00022178) TCustomScpExplorerForm::UpdateSessionData
(000220E3) TCustomScpExplorerForm::UpdateSession
(00007E80) TCustomScpExplorerForm::SessionChanging
(000BE8EF) TTerminalManager::DoSetActiveSession
(000BE840) TTerminalManager::SetActiveSession
(0001BD8E) TCustomScpExplorerForm::NewSession
(0001BDD7) TCustomScpExplorerForm::NewTab
(0002408B) TCustomScpExplorerForm::SessionTabSwitched
(00024108) TCustomScpExplorerForm::SessionsPageControlChange
(00423409) Vcl::Comctrls::TCustomTabControl::Change
(003F6B91) Vcl::Controls::TWinControl::WndProc
(003F1C88) Vcl::Controls::TControl::Perform
(003F6CF7) Vcl::Controls::_17076
(003F6B91) Vcl::Controls::TWinControl::WndProc
(003B10A0) 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 6.1.2

Error message:
Invalid access to memory.

Stack trace:
(00DFCFAF) TTerminal::PeekCurrentDirectory
(0008792F) ntdll.dll
(00073F81) ntdll.dll.KiUserExceptionDispatcher
(00022178) TCustomScpExplorerForm::UpdateSessionData
(000220E3) TCustomScpExplorerForm::UpdateSession
(00021AC7) TCustomScpExplorerForm::DoCollectWorkspace
(0002E248) TCustomScpExplorerForm::FormClose
(003B05C7) Vcl::Forms::TCustomForm::DoClose
(003F6B91) Vcl::Controls::TWinControl::WndProc
(003B10A0) Vcl::Forms::TCustomForm::WndProc

The problem happens rarely. I cannot reproduce it.