<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 5.17.3

Error message:
メモリのアクセス違反

スタック トレース:
(0021B523) Vcl::Graphics::TBrush::GetHandle
(00087D7F) ntdll.dll
(00073221) ntdll.dll.KiUserExceptionDispatcher
(0021C853) Vcl::Graphics::TCanvas::CreateBrush
(004C383C) Tbxofficexptheme::TTBXOfficeXPTheme::PaintImage
(004B44F5) Tbx::DrawTBXImage
(004C7720) Tbxstatusbars::TTBXCustomStatusBar::PaintPanel

The problem happens rarely. I cannot reproduce it.