<Intenta describir los pasos precisos que conducen al problema (dónde haces clic, qué teclas presionas, qué ves, etc.)>
<Si es relevante, considere adjuntar un archivo de registro de sesión o una captura de pantalla)>

WinSCP 6.5.4

Mensaje de error:
Acceso a memoria no válido

Rastreo de la pila:
(000CF962) TTerminalManager:: MiniaturaNecesaria
(000B34EF) ntdll.dll
(0007A66A) ntdll.dll.KiUserExceptionDispatcher
(00035B54) TCustomScpExplorerForm::RemoteDirViewThumbnailNeeded
(00BB3818) TUnixDirView::ItemThumbnail
(0050668F) Customdirview::TCustomDirView::CNNotify
(0039E3C2) Vcl::Controles::TControl::WndProc
(003A356D) Vcl::Controles::TWinControl::WndProc
(0041B07F) Vcl::Comctrls::TCustomListView::WndProc
(003A36C7) Vcl::Controles::_17122
(003A356D) Vcl::Controles::TWinControl::WndProc
(003A2A78) Vcl::Controles::TWinControl::MainWndProc
(00204C90) Sistem::Clase::_18364
(00038B21) USER32.dll
(00026C48) USER32.dll
(000266EB) USER32.dll
(00032F87) USER32.dll
(0007A644) ntdll.dll.KiUserCallbackDispatcher
(00040143) USER32.dll
(00026411) USER32.dll.SendMessageW
(0009BB16) COMCTL32.DLL
(0009D07C) COMCTL32.DLL
(000D2D29) COMCTL32.DLL
(0009DC1D) COMCTL32.DLL
(00092F33) COMCTL32.DLL
(000930A0) COMCTL32.DLL
(0009318C) COMCTL32.DLL
(00093207) COMCTL32.DLL
(000958DE) COMCTL32.DLL
(00094662) COMCTL32.DLL
(00038B21) USER32.dll
(00026C48) USER32.dll
(000263B5) USER32.dll.CallWindowProcW
(003A3675) Vcl::Controles::TWinControl::DefaultHandler
(003A81FF) Vcl::Controles::TWinControl::WMPrintClient
(0039E3C2) Vcl::Controles::TControl::WndProc
(003A356D) Vcl::Controles::TWinControl::WndProc
(0041B07F) Vcl::Comctrls::TCustomListView::WndProc
(003A3FCB) Vcl::Controles::TWinControl::WMPaint
(0041CF29) Vcl::Comctrls::TCustomListView::WMPaint
(003A356D) Vcl::Controles::TWinControl::WndProc
(0041B07F) Vcl::Comctrls::TCustomListView::WndProc
(00204C90) Sistem::Clase::_18364
(00038B21) USER32.dll
(00026C48) USER32.dll
(000263B5) USER32.dll.CallWindowProcW
(000829E4) COMCTL32.DLL
(00082A83) COMCTL32.DLL
(000827FC) COMCTL32.DLL
(00038B21) USER32.dll
(00026C48) USER32.dll
(000263B5) USER32.dll.CallWindowProcW
(0053954B) Dragdrop::TDragDrop::WndMethod
(00204C90) Sistem::Clase::_18364
(00038B21) USER32.dll
(00026C48) USER32.dll
(000266EB) USER32.dll
(00032F87) USER32.dll
(0007A644) ntdll.dll.KiUserCallbackDispatcher
(00028198) USER32.dll
(0002BB89) UXTHEME.DLL
(000277A3) UXTHEME.DLL
(000269D3) UXTHEME.DLL
(000282C7) USER32.dll
(00038B21) USER32.dll
(00026C48) USER32.dll
(000263B5) USER32.dll.CallWindowProcW
(003A3675) Vcl::Controles::TWinControl::DefaultHandler
(004AB1FD) Vcl::Formularios::TCustomForm::WMSysCommand
(0039E3C2) Vcl::Controles::TControl::WndProc
(003A356D) Vcl::Controles::TWinControl::WndProc
(004A77B4) Vcl::Forms::TCustomForm::WndProc
(00E06C23) Vclcommon::C4884_0
(003A2A78) Vcl::Controles::TWinControl::MainWndProc
(00204C90) Sistem::Clase::_18364
(00038B21) USER32.dll
(00026C48) USER32.dll
(000266EB) USER32.dll
(00032F87) USER32.dll
(0007A644) ntdll.dll.KiUserCallbackDispatcher
(00028198) USER32.dll
(0002BB89

The problem happens rarely. I cannot reproduce it.