Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMouseHandler.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMouseHandler.cpp	(revision 51202)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/UIMouseHandler.cpp	(revision 51203)
@@ -180,5 +180,5 @@
         QPoint visibleRectanglePos = m_views[m_iMouseCaptureViewIndex]->mapToGlobal(m_viewports[m_iMouseCaptureViewIndex]->pos());
         visibleRectangle.translate(visibleRectanglePos);
-        visibleRectangle = visibleRectangle.intersected(QApplication::desktop()->availableGeometry());
+        visibleRectangle = visibleRectangle.intersected(QApplication::desktop()->availableGeometry(machineLogic()->machineWindows()[m_iMouseCaptureViewIndex]));
 
 #ifdef Q_WS_WIN
@@ -1082,5 +1082,5 @@
         viewportRectangle.translate(viewportRectangleGlobalPos);
         /* Trim full-viewport-rectangle by available geometry: */
-        viewportRectangle = viewportRectangle.intersected(QApplication::desktop()->availableGeometry());
+        viewportRectangle = viewportRectangle.intersected(QApplication::desktop()->availableGeometry(machineLogic()->machineWindows()[m_iMouseCaptureViewIndex]));
         /* Trim partial-viewport-rectangle by top-most windows: */
         QRegion viewportRegion(viewportRectangle);