Invalid access to memory - TTerminal::ShowExtendedException

<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 5.8

Error message:
Invalid access to memory.

Stack trace:
(00734AA3) TTerminal::ShowExtendedException
(0007C30F) ntdll.dll
(00069B7A) ntdll.dll.KiUserExceptionDispatcher
(0003D8B8) TScpCommanderForm::StartingDisconnected
(0002113F) TCustomScpExplorerForm::CMShowingChanged
(000210B4) TCustomScpExplorerForm::Dispatch
(0022E089) Vcl::Controls::TWinControl::WndProc
(001E8538) Vcl::Forms::TCustomForm::WndProc
(007BBE5D) Vclcommon::C2739_0
(00229180) Vcl::Controls::TControl::Perform
(0022D479) Vcl::Controls::TWinControl::UpdateShowing
(0022D588) Vcl::Controls::TWinControl::UpdateControlState
(0023012E) Vcl::Controls::TWinControl::CMVisibleChanged
(0022E089) Vcl::Controls::TWinControl::WndProc
(001E8538) Vcl::Forms::TCustomForm::WndProc
(007BBF84) Vclcommon::C2739_0
(00229180) Vcl::Controls::TControl::Perform
(00227B0E) Vcl::Controls::TControl::SetVisible
(000BAB54) Execute
(0000249C) wWinMain
(00818A29) __wstartup
(00058CD2) ntdll.dll
(00058C9A) ntdll.dll

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 5.8

Error message:
Invalid access to memory.

Stack trace:
(00734AA3) TTerminal::ShowExtendedException
(00002275) ntdll.dll.RtlConvertUlongToLargeInteger
(0000D485) ntdll.dll.KiUserExceptionDispatcher
(0003D8B8) TScpCommanderForm::StartingDisconnected
(0002113F) TCustomScpExplorerForm::CMShowingChanged
(000210B4) TCustomScpExplorerForm::Dispatch
(0022E089) Vcl::Controls::TWinControl::WndProc
(001E8538) Vcl::Forms::TCustomForm::WndProc
(007BBE5D) Vclcommon::C2739_0
(00229180) Vcl::Controls::TControl::Perform
(0022D479) Vcl::Controls::TWinControl::UpdateShowing
(0022D588) Vcl::Controls::TWinControl::UpdateControlState
(0023012E) Vcl::Controls::TWinControl::CMVisibleChanged
(0022E089) Vcl::Controls::TWinControl::WndProc
(001E8538) Vcl::Forms::TCustomForm::WndProc
(007BBF84) Vclcommon::C2739_0
(00229180) Vcl::Controls::TControl::Perform
(00227B0E) Vcl::Controls::TControl::SetVisible
(000BAB54) Execute
(0000249C) wWinMain
(00818A29) __wstartup

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.

It happens every time I run it, even if I run it as an administrator.

WinSCP 5.8.2

Error message:
Invalid access to memory.

Stack trace:
(00754E5F) TTerminal::ShowExtendedException
(000623AA) ntdll.dll
(0000F12E) ntdll.dll.KiUserExceptionDispatcher
(0003E1B4) TScpCommanderForm::StartingDisconnected
(00021B13) TCustomScpExplorerForm::CMShowingChanged
(00021A88) TCustomScpExplorerForm::Dispatch
(00236A39) Vcl::Controls::TWinControl::WndProc
(001F0EE8) Vcl::Forms::TCustomForm::WndProc
(007E6C31) Vclcommon::C2754_0
(00231B30) Vcl::Controls::TControl::Perform
(00235E29) Vcl::Controls::TWinControl::UpdateShowing
(00235F38) Vcl::Controls::TWinControl::UpdateControlState
(00238ADE) Vcl::Controls::TWinControl::CMVisibleChanged
(00236A39) Vcl::Controls::TWinControl::WndProc
(001F0EE8) Vcl::Forms::TCustomForm::WndProc
(007E6D58) Vclcommon::C2754_0
(00231B30) Vcl::Controls::TControl::Perform
(002304BE) Vcl::Controls::TControl::SetVisible
(000C1C6C) Execute
(000024A8) wWinMain
(0083EB55) C4941_0
(000387F0) ntdll.dll
(000387C0) ntdll.dll

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.

<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 5.8.2

Error message:
Invalid access to memory.

Stack trace:
(00754E5F) TTerminal::ShowExtendedException
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(0003E1B4) TScpCommanderForm::StartingDisconnected
(00021B13) TCustomScpExplorerForm::CMShowingChanged
(00021A88) TCustomScpExplorerForm::Dispatch
(00236A39) Vcl::Controls::TWinControl::WndProc
(001F0EE8) Vcl::Forms::TCustomForm::WndProc
(007E6C31) Vclcommon::C2754_0
(00231B30) Vcl::Controls::TControl::Perform
(00235E29) Vcl::Controls::TWinControl::UpdateShowing
(00235F38) Vcl::Controls::TWinControl::UpdateControlState
(00238ADE) Vcl::Controls::TWinControl::CMVisibleChanged
(00236A39) Vcl::Controls::TWinControl::WndProc
(001F0EE8) Vcl::Forms::TCustomForm::WndProc
(007E6D58) Vclcommon::C2754_0
(00231B30) Vcl::Controls::TControl::Perform
(002304BE) Vcl::Controls::TControl::SetVisible
(000C1C6C) Execute
(000024A8) wWinMain
(0083EB55) C4941_0
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

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 5.8

Error message:
Invalid access to memory.

Stack trace:
(00734AA3) TTerminal::ShowExtendedException
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(0003D8B8) TScpCommanderForm::StartingDisconnected
(0002113F) TCustomScpExplorerForm::CMShowingChanged
(000210B4) TCustomScpExplorerForm::Dispatch
(0022E089) Vcl::Controls::TWinControl::WndProc
(001E8538) Vcl::Forms::TCustomForm::WndProc
(007BBE5D) Vclcommon::C2739_0
(00229180) Vcl::Controls::TControl::Perform
(0022D479) Vcl::Controls::TWinControl::UpdateShowing
(0022D588) Vcl::Controls::TWinControl::UpdateControlState
(0023012E) Vcl::Controls::TWinControl::CMVisibleChanged
(0022E089) Vcl::Controls::TWinControl::WndProc
(001E8538) Vcl::Forms::TCustomForm::WndProc
(007BBF84) Vclcommon::C2739_0
(00229180) Vcl::Controls::TControl::Perform
(00227B0E) Vcl::Controls::TControl::SetVisible
(000BAB54) Execute
(0000249C) wWinMain
(00818A29) __wstartup
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

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.

Error during startup, after error screen program continues normaly.

WinSCP 5.8.1

Error message:
Invalid access to memory.

Stack trace:
(0074619B) TTerminal::ShowExtendedException
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(0003D8B8) TScpCommanderForm::StartingDisconnected
(0002113F) TCustomScpExplorerForm::CMShowingChanged
(000210B4) TCustomScpExplorerForm::Dispatch
(0022E601) Vcl::Controls::TWinControl::WndProc
(001E8AB0) Vcl::Forms::TCustomForm::WndProc
(007D1531) Vclcommon::C2747_0
(002296F8) Vcl::Controls::TControl::Perform
(0022D9F1) Vcl::Controls::TWinControl::UpdateShowing
(0022DB00) Vcl::Controls::TWinControl::UpdateControlState
(002306A6) Vcl::Controls::TWinControl::CMVisibleChanged
(0022E601) Vcl::Controls::TWinControl::WndProc
(001E8AB0) Vcl::Forms::TCustomForm::WndProc
(007D1658) Vclcommon::C2747_0
(002296F8) Vcl::Controls::TControl::Perform
(00228086) Vcl::Controls::TControl::SetVisible
(000BB0C8) Execute
(0000249C) wWinMain
(0082E299) C4934_0
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

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.

Hi,

I don't really want to be contacted unless needed but every time I start WinSCP (after the upgrade I did today) I get the attached error. I see it reported below... so I will just wait for the general resolution.

However, if I click okay it seems that WinSCP does start.

Regards,
Andrew


<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 5.8.3

Error message:
Invalid access to memory.

Stack trace:
(007673B7) TTerminal::ShowExtendedException
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(000408BC) TScpCommanderForm::StartingDisconnected
(000226DB) TCustomScpExplorerForm::CMShowingChanged
(00022650) TCustomScpExplorerForm::Dispatch
(002471B9) Vcl::Controls::TWinControl::WndProc
(00201668) Vcl::Forms::TCustomForm::WndProc
(007FF039) Vclcommon::C2754_0
(002422B0) Vcl::Controls::TControl::Perform
(002465A9) Vcl::Controls::TWinControl::UpdateShowing
(002466B8) Vcl::Controls::TWinControl::UpdateControlState
(0024925E) Vcl::Controls::TWinControl::CMVisibleChanged
(002471B9) Vcl::Controls::TWinControl::WndProc
(00201668) Vcl::Forms::TCustomForm::WndProc
(007FF160) Vclcommon::C2754_0
(002422B0) Vcl::Controls::TControl::Perform
(00240C3E) Vcl::Controls::TControl::SetVisible
(000D23EC) Execute
(000024A8) wWinMain
(008574F1) __wstartup
(00038900) ntdll.dll
(000388D0) ntdll.dll

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 reports.
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 5.8.4

Error message:
Invalid access to memory.

Stack trace:
(0076EE17) TTerminal::ShowExtendedException
(00045CC6) ntdll.dll.RtlRaiseStatus
(00045B52) ntdll.dll.KiUserExceptionDispatcher
(00040D3C) TScpCommanderForm::StartingDisconnected
(00022AF7) TCustomScpExplorerForm::CMShowingChanged
(00022A6C) TCustomScpExplorerForm::Dispatch
(0024E5E9) Vcl::Controls::TWinControl::WndProc
(00208A98) Vcl::Forms::TCustomForm::WndProc
(00807955) Vclcommon::C2754_0
(002496E0) Vcl::Controls::TControl::Perform
(0024D9D9) Vcl::Controls::TWinControl::UpdateShowing
(0024DAE8) Vcl::Controls::TWinControl::UpdateControlState
(0025068E) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E5E9) Vcl::Controls::TWinControl::WndProc
(00208A98) Vcl::Forms::TCustomForm::WndProc
(00807A7C) Vclcommon::C2754_0
(002496E0) Vcl::Controls::TControl::Perform
(0024806E) Vcl::Controls::TControl::SetVisible
(000D700D) Execute
(000024A8) wWinMain
(0085FE0D) __wstartup
(00062646) ntdll.dll
(00062616) ntdll.dll

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.

<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 5.9

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(0076F043) TTerminal::ShowExtendedException
(00052DD6) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00040D70) TScpCommanderForm::StartingDisconnected
(00022B23) TCustomScpExplorerForm::CMShowingChanged
(00022A98) TCustomScpExplorerForm::Dispatch
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807CED) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024DB05) Vcl::Controls::TWinControl::UpdateShowing
(0024DC14) Vcl::Controls::TWinControl::UpdateControlState
(002507BA) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807E14) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024819A) Vcl::Controls::TControl::SetVisible
(000D7139) Execute
(000024A8) wWinMain
(008601A5) C4941_0
(00029240) ntdll.dll
(00029210) ntdll.dll

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)>

Just open/start the actual Version of WinSCP on my Windows 10 system. The error comes up after the update - not sure which version I had before.

WinSCP 5.9

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(0076F043) TTerminal::ShowExtendedException
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(00040D70) TScpCommanderForm::StartingDisconnected
(00022B23) TCustomScpExplorerForm::CMShowingChanged
(00022A98) TCustomScpExplorerForm::Dispatch
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807CED) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024DB05) Vcl::Controls::TWinControl::UpdateShowing
(0024DC14) Vcl::Controls::TWinControl::UpdateControlState
(002507BA) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807E14) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024819A) Vcl::Controls::TControl::SetVisible
(000D7139) Execute
(000024A8) wWinMain
(008601A5) C4941_0
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

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.

Can reproduce just by double-clicking WinSCP.exe

WinSCP 5.9

Error message:
Invalid access to memory.

Stack trace:
(0076F043)
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00040D70)
(00022B23)
(00022A98)
(0024E715)
(00208BC4)
(00807CED) @@Synchronizeprogress@Finalize
(0024980C)
(0024DB05)
(0024DC14)
(002507BA)
(0024E715)
(00208BC4)
(00807E14) @@Synchronizeprogress@Finalize
(0024980C)
(0024819A)
(000D7139)
(000024A8)
(008601A5)
(00038900) ntdll.dll
(000388D0) ntdll.dll

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 5.9

Error message:
Invalid access to memory.

Stack trace:
(0076F043) TTerminal::ShowExtendedException
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00040D70) TScpCommanderForm::StartingDisconnected
(00022B23) TCustomScpExplorerForm::CMShowingChanged
(00022A98) TCustomScpExplorerForm::Dispatch
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807CED) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024DB05) Vcl::Controls::TWinControl::UpdateShowing
(0024DC14) Vcl::Controls::TWinControl::UpdateControlState
(002507BA) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807E14) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024819A) Vcl::Controls::TControl::SetVisible
(000D7139) Execute
(000024A8) wWinMain
(008601A5) C4941_0
(00038900) ntdll.dll
(000388D0) ntdll.dll

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 5.9

Error message:
Ошибка доступа к памяти.

Трассировка стека:
(0076F043) TTerminal::ShowExtendedException
(0003B84E) ntdll.dll
(0003B6B6) ntdll.dll.KiUserExceptionDispatcher
(00040D70) TScpCommanderForm::StartingDisconnected
(00022B23) TCustomScpExplorerForm::CMShowingChanged
(00022A98) TCustomScpExplorerForm::Dispatch
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807CED) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024DB05) Vcl::Controls::TWinControl::UpdateShowing
(0024DC14) Vcl::Controls::TWinControl::UpdateControlState
(002507BA) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807E14) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024819A) Vcl::Controls::TControl::SetVisible
(000D7139) Execute
(000024A8) wWinMain
(008601A5) C4941_0
(0004FBB9) ntdll.dll
(0004FB8C) ntdll.dll

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 5.9

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(0076F043) TTerminal::ShowExtendedException
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00040D70) TScpCommanderForm::StartingDisconnected
(00022B23) TCustomScpExplorerForm::CMShowingChanged
(00022A98) TCustomScpExplorerForm::Dispatch
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807CED) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024DB05) Vcl::Controls::TWinControl::UpdateShowing
(0024DC14) Vcl::Controls::TWinControl::UpdateControlState
(002507BA) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807E14) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024819A) Vcl::Controls::TControl::SetVisible
(000D7139) Execute
(000024A8) wWinMain
(008601A5) C4941_0
(00038900) ntdll.dll
(000388D0) ntdll.dll

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 5.9

Error message:
Invalid access to memory.

Stack trace:
(0076F043) TTerminal::ShowExtendedException
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00040D70) TScpCommanderForm::StartingDisconnected
(00022B23) TCustomScpExplorerForm::CMShowingChanged
(00022A98) TCustomScpExplorerForm::Dispatch
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807CED) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024DB05) Vcl::Controls::TWinControl::UpdateShowing
(0024DC14) Vcl::Controls::TWinControl::UpdateControlState
(002507BA) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807E14) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024819A) Vcl::Controls::TControl::SetVisible
(000D7139) Execute
(000024A8) wWinMain
(008601A5) C4941_0
(00038900) ntdll.dll
(000388D0) ntdll.dll

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.

Every time when i start empty session.
when i start direct last use profile all works fine


WinSCP 5.9

Error message:
Naruszenie ochrony pamęci.

Stack trace:
(0076F043) TTerminal::ShowExtendedException
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(00040D70) TScpCommanderForm::StartingDisconnected
(00022B23) TCustomScpExplorerForm::CMShowingChanged
(00022A98) TCustomScpExplorerForm::Dispatch
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807CED) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024DB05) Vcl::Controls::TWinControl::UpdateShowing
(0024DC14) Vcl::Controls::TWinControl::UpdateControlState
(002507BA) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807E14) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024819A) Vcl::Controls::TControl::SetVisible
(000D7139) Execute
(000024A8) wWinMain
(008601A5) C4941_0
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

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

Tried opening WinSCP from the install confirmation window.

WinSCP 5.9

Error message:
Invalid access to memory.

Stack trace:
(0076F043) TTerminal::ShowExtendedException
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(00040D70) TScpCommanderForm::StartingDisconnected
(00022B23) TCustomScpExplorerForm::CMShowingChanged
(00022A98) TCustomScpExplorerForm::Dispatch
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807CED) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024DB05) Vcl::Controls::TWinControl::UpdateShowing
(0024DC14) Vcl::Controls::TWinControl::UpdateControlState
(002507BA) Vcl::Controls::TWinControl::CMVisibleChanged
(0024E715) Vcl::Controls::TWinControl::WndProc
(00208BC4) Vcl::Forms::TCustomForm::WndProc
(00807E14) Vclcommon::C2754_0
(0024980C) Vcl::Controls::TControl::Perform
(0024819A) Vcl::Controls::TControl::SetVisible
(000D7139) Execute
(000024A8) wWinMain
(008601A5) C4941_0
(00038900) ntdll.dll
(000388D0) ntdll.dll

The problem happens rarely. I cannot reproduce it.

This bug has been added to the tracker:
https://winscp.net/tracker/1435