Diálogo del que no puedo deshacerme

Buscar OS X identificar proceso por ventana He encontrado A qué proceso pertenece una determinada ventana (Mac OS X) que me dijo esto después de mover la Ventana:

RetinaMBPro1TB:bin jeroenp$ ./show-recently-moved-windows.py 
Move target window

List of windows that moved:
{(
        {
        kCGWindowAlpha = 1;
        kCGWindowBounds =         {
            Height = 1094;
            Width = 1130;
            X = 43;
            Y = 45;
        };
        kCGWindowIsOnscreen = 1;
        kCGWindowLayer = 0;
        kCGWindowMemoryUsage = 5246548;
        kCGWindowName = "bin \U2014 Python \U2014 160\U00d776";
        kCGWindowNumber = 23921;
        kCGWindowOwnerName = Terminal;
        kCGWindowOwnerPID = 357;
        kCGWindowSharingState = 1;
        kCGWindowStoreType = 2;
    },
        {
        kCGWindowAlpha = 1;
        kCGWindowBounds =         {
            Height = 153;
            Width = 420;
            X = 1359;
            Y = 182;
        };
        kCGWindowIsOnscreen = 1;
        kCGWindowLayer = 8;
        kCGWindowMemoryUsage = 390292;
        kCGWindowName = "";
        kCGWindowNumber = 23246;
        kCGWindowOwnerName = CoreServicesUIAgent;
        kCGWindowOwnerPID = 87976;
        kCGWindowSharingState = 1;
        kCGWindowStoreType = 2;
    }
)}

Desde CoreServicesUIAgent es el propietario, he realizado esto:

killall -KILL CoreServicesUIAgent

Ha funcionado. Ahora puedo volver a abrir el PDF.