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Upgraded to Windows 8.1 and dual monitor. Have a program that uses _WinAPI_RedrawWindow that does not seem to work. Tried example in help file and it does not erase cross. See notation below. What am I doing wrong? (forgot how to include code in a separate window - sorry) #include <WindowsConstants.au3> #include <WinAPI.au3> ShowCross(@DesktopWidth / 2, @DesktopHeight / 2, 20, 2, 0xFF, 3000) Func ShowCross($start_x, $start_y, $length, $width, $color, $time) Local $hDC, $hPen, $obj_orig $hDC = _WinAPI_GetWindowDC(0) ; DC of entire screen (desktop) $hPen = _WinAPI_CreatePen($PS_SOLID, $width, $color) $obj_orig = _WinAPI_SelectObject($hDC, $hPen) _WinAPI_DrawLine($hDC, $start_x - $length, $start_y, $start_x - 5, $start_y) ; horizontal left _WinAPI_DrawLine($hDC, $start_x + $length, $start_y, $start_x + 5, $start_y) ; horizontal right _WinAPI_DrawLine($hDC, $start_x, $start_y - $length, $start_x, $start_y - 5) ; vertical up ; _WinAPI_DrawLine($hDC, $start_x, $start_y + $length, $start_x, $start_y + 5) ; vertical down _WinAPI_MoveTo($hDC, $start_x, $start_y + $length) _WinAPI_LineTo($hDC, $start_x, $start_y + 5) Sleep($time) ; show cross over screen for defined seconds ; refresh desktop (clear cross) _WinAPI_RedrawWindow(_WinAPI_GetDesktopWindow(), 0, 0, $RDW_INVALIDATE + $RDW_ALLCHILDREN) ;<<<<<< does not seem to work ; clear resources _WinAPI_SelectObject($hDC, $obj_orig) _WinAPI_DeleteObject($hPen) _WinAPI_ReleaseDC(0, $hDC) EndFunc ;==>ShowCross