<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)> I attempted to rename a file, then hit tab to move to the second file to rename.
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.7

Error message:
Abnormal program termination

Stack trace:
(00A9D722) TSFTPFileSystem::CustomReadFile
(00AA08BD) TSFTPFileSystem::ReadFile
(00ACFC08) TTerminal::ReadFile
(00AD0D3C) TTerminal::TryReadFile
(00AD8265) TTerminal::DoRenameOrCopyFile
(00AD7895) TTerminal::RenameFile
(008EFAB9) TUnixDirView::InternalEdit
(005350EB) Customdirview::TCustomDirView::Edit
(00446864) Vcl::Comctrls::TCustomListView::CNNotify
(005204F2) Nortonlikelistview::TCustomNortonLikeListView::CNNotify
(003CA36A) Vcl::Controls::TControl::WndProc
(003CF515) Vcl::Controls::TWinControl::WndProc
(00447027) Vcl::Comctrls::TCustomListView::WndProc
(003CF66F) Vcl::Controls::_17122
(003CF515) Vcl::Controls::TWinControl::WndProc
(003CEA20) Vcl::Controls::TWinControl::MainWndProc
(00235394) System::Classes::_18364
(00038CC1) USER32.dll
(00027D78) USER32.dll
(0002781B) USER32.dll
(000329D7) USER32.dll
(00079604) ntdll.dll
(00040403) USER32.dll
(00027541) USER32.dll
(0009BB16) COMCTL32.DLL
(001A7A4B) COMCTL32.DLL
(000D4FA1) COMCTL32.DLL
(001A690D) COMCTL32.DLL
(001A7F47) COMCTL32.DLL
(00038CC1) USER32.dll
(00027D78) USER32.dll
(00026D45) USER32.dll
(000268AB) USER32.dll

The problem happens rarely. I cannot reproduce it.