Index: /trunk/src/VBox/Frontends/VirtualBox/src/runtime/fullscreen/UIMachineWindowFullscreen.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/runtime/fullscreen/UIMachineWindowFullscreen.cpp	(revision 61855)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/runtime/fullscreen/UIMachineWindowFullscreen.cpp	(revision 61856)
@@ -211,4 +211,12 @@
     setWindowState(Qt::WindowNoState);
     windowHandle()->showMinimized();
+
+    /* If there is mini-toolbar: */
+    if (m_pMiniToolBar)
+    {
+        /* Hide mini-toolbar and reset it's state to NONE: */
+        m_pMiniToolBar->setWindowState(Qt::WindowNoState);
+        m_pMiniToolBar->hide();
+    }
 #  endif /* VBOX_WS_X11 */
 # endif /* QT_VERSION >= 0x050000 */