<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 6.3.7

Error message:
Error getting name of current remote directory.

Invalid access to memory.

Stack trace:
(00B55BB9) TFTPFileSystem::HandleListData
(00E2529A) C6612_0
(00E27302) ____ExceptionHandler
(00E240BC) __ExceptionHandler
(000B046F) ntdll.dll
(0007AB0A) ntdll.dll.KiUserExceptionDispatcher
(00B3F867) TFileZillaImpl::HandleListData
(005B3C99) TFileZillaIntf::HandleMessage
(00B4F87C) TFTPFileSystem::ProcessMessage
(00B4FB5F) TFTPFileSystem::DoWaitForReply
(00B4FC4B) TFTPFileSystem::WaitForReply
(00B4FCA4) TFTPFileSystem::WaitForCommandReply
(00C687A5) TTerminal::ReadCurrentDirectory
(00C63F6F) TTerminal::ReactOnCommand
(00C64FE1) TTerminal::SetCurrentDirectoryW
(00AEA8EE) TUnixDirView::SetPath
(0005FC59) TScpCommanderForm::DoPathLabelPathClick
(0005FD24) TScpCommanderForm::RemotePathLabelPathClick
(004832F9) Pathlabel::TCustomPathLabel::DoPathClick
(004816B9) Pathlabel::TCustomPathLabel::Click
(00404F19) Vcl::Controls::TControl::WMLButtonUp
(00404154) Vcl::Controls::TControl::Perform
(004088FF) Vcl::Controls::TWinControl::IsControlMouseMsg
(00408678) Vcl::Controls::TWinControl::MainWndProc
(00226F7C) System::Classes::_18201
(00036731) USER32.dll
(00024D78) USER32.dll
(00024205) USER32.dll
(00023D6B) USER32.dll.DispatchMessageW

(00E25905) C6612_0
(00E26EDF) _ReThrowException
(00B4FBCC) TFTPFileSystem::DoWaitForReply
(00B4FC4B) TFTPFileSystem::WaitForReply
(00B4FCA4) TFTPFileSystem::WaitForCommandReply
(00C687A5) TTerminal::ReadCurrentDirectory
(00C63F6F) TTerminal::ReactOnCommand
(00C64FE1) TTerminal::SetCurrentDirectoryW
(00AEA8EE) TUnixDirView::SetPath
(0005FC59) TScpCommanderForm::DoPathLabelPathClick
(0005FD24) TScpCommanderForm::RemotePathLabelPathClick
(004832F9) Pathlabel::TCustomPathLabel::DoPathClick
(004816B9) Pathlabel::TCustomPathLabel::Click
(00404F19) Vcl::Controls::TControl::WMLButtonUp
(00404154) Vcl::Controls::TControl::Perform
(004088FF) Vcl::Controls::TWinControl::IsControlMouseMsg
(00408678) Vcl::Controls::TWinControl::MainWndProc
(00226F7C) System::Classes::_18201
(00036731) USER32.dll
(00024D78) USER32.dll
(00024205) USER32.dll
(00023D6B) USER32.dll.DispatchMessageW

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)>
I tried to change from public_ftp to public_html, as admin
WinSCP 5.9.4

Error message:
Error changing directory to '/public_ftp'.

Invalid access to memory.

Stack trace:
(006AECEA) TFTPFileSystem::HandleListData
(00866B5E) C5073_0
(00868BC6) ____ExceptionHandler
(00865980) __ExceptionHandler
(00045D46) ntdll.dll.RtlRaiseStatus
(00045BD2) ntdll.dll.KiUserExceptionDispatcher
(0069784B) TFileZillaImpl::HandleListData
(004F48C0) TFileZillaIntf::HandleMessage
(006A8EA4) TFTPFileSystem::ProcessMessage
(006A912F) TFTPFileSystem::DoWaitForReply
(006A921B) TFTPFileSystem::WaitForReply
(006A9274) TFTPFileSystem::WaitForCommandReply
(0069C382) TFTPFileSystem::ChangeDirectory
(0077E15A) TTerminal::ChangeDirectory
(007745D2) TTerminal::SetCurrentDirectoryW
(00655F66) TUnixDirView::SetPath
(00046062) TScpCommanderForm::RemotePathLabelPathClick
(003FDC0D) Pathlabel::TCustomPathLabel::DoPathClick
(003FC4A7) Pathlabel::TCustomPathLabel::Click
(0024B125) Vcl::Controls::TControl::WMLButtonUp
(0024A360) Vcl::Controls::TControl::Perform
(0024EB37) Vcl::Controls::TWinControl::IsControlMouseMsg
(0024E8B0) Vcl::Controls::TWinControl::MainWndProc
(0037322C) System::Classes::_18201
(0001B4B4) USER32.dll
(0001B5B2) USER32.dll
(0001BBE4) USER32.dll
(0001BC3B) USER32.dll.DispatchMessageW

(008671C9) C5073_0
(008687A3) _ReThrowException
(006A919C) TFTPFileSystem::DoWaitForReply
(006A921B) TFTPFileSystem::WaitForReply
(006A9274) TFTPFileSystem::WaitForCommandReply
(0069C382) TFTPFileSystem::ChangeDirectory
(0077E15A) TTerminal

The problem happens rarely. I cannot reproduce it.

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.

Easy, and it's been a problem with EVERY version of WinSCP: in Explorer view, if I start to type a folder name while the treeview has focus, WinSCP abends. Sometimes I get lucky, so then can click on the listview side and continue on.

WinSCP 5.9

Error message:
Error getting name of current remote directory.

Invalid access to memory.

Stack trace:
(006AB982) TFTPFileSystem::HandleListData
(0086216E) C5073_3
(008641D6) ____ExceptionHandler
(00860F90) __ExceptionHandler
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(006945CF) TFileZillaImpl::HandleListData
(004F3C00) TFileZillaIntf::HandleMessage
(006A5BC0) TFTPFileSystem::ProcessMessage
(006A5E4B) TFTPFileSystem::DoWaitForReply
(006A5F37) TFTPFileSystem::WaitForReply
(006A5F90) TFTPFileSystem::WaitForCommandReply
(0077343D) TTerminal::ReadCurrentDirectory
(0076F637) TTerminal::ReactOnCommand
(00657E12) TCustomUnixDriveView::Change
(002853FE) Vcl::Comctrls::TCustomTreeView::CNNotify
(0040BF9D) Customdriveview::TCustomDriveView::CNNotify
(0024E715) Vcl::Controls::TWinControl::WndProc
(002856BA) Vcl::Comctrls::TCustomTreeView::WndProc
(0024E87B) Vcl::Controls::_17076
(0024E715) Vcl::Controls::TWinControl::WndProc
(0024DD5C) Vcl::Controls::TWinControl::MainWndProc
(0037264C) System::Classes::_18201
(000374F1) USER32.dll
(00015C3B) USER32.dll
(0001581B) USER32.dll
(0001C167) USER32.dll
(00077E54) ntdll.dll.KiUserCallbackDispatcher
(00014EDE) USER32.dll.SendMessageW
(0007DBD8) COMCTL32.DLL
(00034F23) COMCTL32.DLL
(00034D8A) COMCTL32.DLL
(0010873F) COMCTL32.DLL
(000CF107) COMCTL32.DLL
(000374F1) USER32.dll
(00015C3B) USER32.dll
(000159D2) USER32.dll.CallWindowProcW
(0024E826) Vcl::Control

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.