Division by zero error

OS:Windows 8.1 x64
WinSCP version: 5.7.1 build 5235

Stack trace:
[00F60F2A] Tbxoffice2003theme::PaintIrregularGradient
[77B8023E] ntdll.dll.ZwWow64CallFunction64
[77B809BA] ntdll.dll.KiUserExceptionDispatcher
[00F617BE] Tbxoffice2003theme::TTBXOffice2003Theme::PaintBackgnd
[00F51807] Tbx::TTBXToolbar::WMEraseBkgnd
[00D37CA1] Vcl::Controls::TControl::WndProc
[00D3C7E5] Vcl::Controls::TWinControl::WndProc
[00D3BE2C] Vcl::Controls::TWinControl::MainWndProc
[00E60708] System::Classes::_18201
[772B8E6F] USER32.DLL.CallNextHookEx
[772BAEF8] USER32.DLL
[772B9327] USER32.DLL
[772B9527] USER32.DLL
[77B80994] ntdll.dll.KiUserCallbackDispatcher
[00F2E7DB] Tb2dock::TTBCustomDockableWindow::SetBounds
[00F2C2DA] Tb2dock::TTBDock::ArrangeToolbars
[00F2B4C2] Tb2dock::TTBDock::AlignControls
[00D3AAA2] Vcl::Controls::TWinControl::Realign
[00D3A977] Vcl::Controls::TWinControl::AlignControls
[00D3AA46] Vcl::Controls::TWinControl::AlignControl
[00D3D783] Vcl::Controls::TWinControl::WMSize
[00D3C7E5] Vcl::Controls::TWinControl::WndProc
[00D3BE2C] Vcl::Controls::TWinControl::MainWndProc
[00E60708] System::Classes::_18201
[772B8E6F] USER32.DLL.CallNextHookEx
[772B90CC] USER32.DLL
[772B9327] USER32.DLL
[772B9527] USER32.DLL
[77B80994] ntdll.dll.KiUserCallbackDispatcher
[772BD59A] USER32.DLL
[772BB99A] USER32.DLL
(00001E19) UXTHEME.DLL.[73682E19]
(00001E53) UXTHEME.DLL.[73682E53]
[772BB933] USER32.DLL
[772B8E6F] USER32.DLL.CallNextHookEx
[772B90CC] USER32.DLL
[772BDDD0] USER32.DLL.CallWindowProcW
[00D3C8F6] Vcl::Controls::TWinControl::DefaultHandler

Thanks for your report.

Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.