<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 5.17.7

Error message:
メモリのアクセス違反

スタック トレース:
(0021B8EB) Vcl::Graphics::TBrush::GetHandle
(00087E3F) ntdll.dll
(000732D1) ntdll.dll.KiUserExceptionDispatcher
(0021CC1B) Vcl::Graphics::TCanvas::CreateBrush
(004C3DFC) Tbxofficexptheme::TTBXOfficeXPTheme::PaintImage
(004B4AB5) Tbx::DrawTBXImage
(004C7CE0) Tbxstatusbars::TTBXCustomStatusBar::PaintPanel

The problem happens rarely. I cannot reproduce it.