diff --git a/src/frontends/qt4/GuiView.cpp b/src/frontends/qt4/GuiView.cpp
index eae6bf1357..79f80908c2 100644
--- a/src/frontends/qt4/GuiView.cpp
+++ b/src/frontends/qt4/GuiView.cpp
@@ -646,7 +646,7 @@ bool GuiView::event(QEvent * e)
 			QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 			// FIXME: we should also try to detect special LyX shortcut such as
 			// Alt-P and Alt-M
-			if (ke->modifiers() & Qt::AltModifier || ke->key() == Qt::Key_Alt)
+			if (ke->modifiers() & Qt::AltModifier && ke->key() != Qt::Key_Alt)
 				menuBar()->show();
 			return QMainWindow::event(e);
 		}
diff --git a/src/frontends/qt4/GuiWorkArea.cpp b/src/frontends/qt4/GuiWorkArea.cpp
index e4ca81fc16..2525acd679 100644
--- a/src/frontends/qt4/GuiWorkArea.cpp
+++ b/src/frontends/qt4/GuiWorkArea.cpp
@@ -411,6 +411,12 @@ void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 	// the cursor gets restarted in GuiView::restartCursor()
 	stopBlinkingCursor();
 
+	if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()) {
+		// FIXME: we should not have to do this here. See related comment in
+		// GuiView::event().
+		lyx_view_->menuBar()->hide();
+	}
+
 	theLyXFunc().setLyXView(lyx_view_);
 	theLyXFunc().processKeySym(key, mod);
 }