diff -Naur xfce4-panel-4.4.2/plugins/launcher/launcher-dialog.c xfce4-panel-4.4.2.tpg/plugins/launcher/launcher-dialog.c
--- xfce4-panel-4.4.2/plugins/launcher/launcher-dialog.c	2007-11-17 19:30:57.000000000 +0000
+++ xfce4-panel-4.4.2.tpg/plugins/launcher/launcher-dialog.c	2008-05-19 13:35:05.000000000 +0000
@@ -1334,6 +1334,9 @@
                 GTK_STOCK_CLOSE, GTK_RESPONSE_OK,
                 NULL);
 
+    gtk_window_set_screen (GTK_WINDOW (ld->dlg),
+                           gtk_widget_get_screen (GTK_WIDGET (plugin)));
+
     g_object_set_data (G_OBJECT (plugin), "dialog", ld->dlg);
     g_object_set_data (G_OBJECT (plugin), "launcher-dialog", ld);
 
diff -Naur xfce4-panel-4.4.2/plugins/pager/pager.c xfce4-panel-4.4.2.tpg/plugins/pager/pager.c
--- xfce4-panel-4.4.2/plugins/pager/pager.c	2007-11-17 19:30:58.000000000 +0000
+++ xfce4-panel-4.4.2.tpg/plugins/pager/pager.c	2008-05-19 13:35:05.000000000 +0000
@@ -340,6 +340,9 @@
                 GTK_STOCK_CLOSE, GTK_RESPONSE_OK,
                 NULL);
 
+    gtk_window_set_screen (GTK_WINDOW (dlg),
+                           gtk_widget_get_screen (GTK_WIDGET (plugin)));
+
     g_object_set_data (G_OBJECT (plugin), "dialog", dlg);
 
     gtk_window_set_position (GTK_WINDOW (dlg), GTK_WIN_POS_CENTER);