diff -r 93b982ccede2 -r 5daf16870df6 demos/mainwindow/mainwindow.cpp
--- a/demos/mainwindow/mainwindow.cpp	Mon Jun 21 22:38:13 2010 +0100
+++ b/demos/mainwindow/mainwindow.cpp	Thu Jul 22 16:41:55 2010 +0100
@@ -329,7 +329,7 @@
             BlueTitleBar *titlebar = new BlueTitleBar(swatch);
             swatch->setTitleBarWidget(titlebar);
             connect(swatch, SIGNAL(topLevelChanged(bool)), titlebar, SLOT(updateMask()));
-            connect(swatch, SIGNAL(featuresChanged(QDockWidget::DockWidgetFeatures)), titlebar, SLOT(updateMask()));
+            connect(swatch, SIGNAL(featuresChanged(QDockWidget::DockWidgetFeatures)), titlebar, SLOT(updateMask()), Qt::QueuedConnection);
 
 #ifdef Q_WS_QWS
             QPalette pal = palette();