--- src/gui/kernel/orig.qt_cocoa_helpers_mac.mm	2015-01-17 15:43:32.000000000 +0100
+++ src/gui/kernel/qt_cocoa_helpers_mac.mm	2015-02-10 19:19:43.000000000 +0100
@@ -91,6 +91,8 @@
 #include <private/qwidget_p.h>
 #include <private/qcocoawindow_mac_p.h>
 
+#include <string.h>
+
 QT_BEGIN_NAMESPACE
 
 #ifdef QT_MAC_USE_COCOA
@@ -1257,7 +1259,8 @@ bool qt_mac_handleMouseEvent(NSEvent *event, QEvent::Type eventType, Qt::MouseBu
         break;
     }
 
-    qt_mac_updateCursorWithWidgetUnderMouse(widgetUnderMouse);
+    if ([[NSApplication sharedApplication] isActive])
+        qt_mac_updateCursorWithWidgetUnderMouse(widgetUnderMouse);
 
     DnDParams *dndParams = currentDnDParameters();
     dndParams->view = view;
@@ -1280,8 +1283,19 @@ bool qt_mac_handleMouseEvent(NSEvent *event, QEvent::Type eventType, Qt::MouseBu
         // released. We therefore need to re-check if should send (delayed) enter leave events:
         // qt_button_down has now become NULL since the call at the top of the function. Also, since
         // the relase might have closed a window, we dont give the nativeWidget hint
-        qt_mac_getTargetForMouseEvent(0, QEvent::None, localPoint, globalPoint, nativeWidget, &widgetUnderMouse);
-        qt_mac_checkEnterLeaveForNativeWidgets(widgetUnderMouse);
+        //qt_mac_getTargetForMouseEvent(0, QEvent::None, localPoint, globalPoint, nativeWidget, &widgetUnderMouse);
+        //RJVB:
+//         ProcessSerialNumber current, front;
+//         GetCurrentProcess(&current);
+//         GetFrontProcess(&front);
+        qt_mac_getTargetForMouseEvent(0, QEvent::None, localPoint, globalPoint, NULL, &widgetUnderMouse);
+        if ( [[NSApplication sharedApplication] isActive] /*memcmp(&current, &front, sizeof(ProcessSerialNumber)) == 0*/) {
+            qt_mac_checkEnterLeaveForNativeWidgets(widgetUnderMouse);
+        }
+        else if (widgetUnderMouse) {
+            qDebug() << "Background application does not deliver mouse button release event to" << widgetUnderMouse
+                << "at" << globalPoint;
+        }
     }
 
     previousButton = button;