--- a/src/gui/qgsmaptoolpan.cpp	2012-06-12 21:28:18.000000000 +0200
+++ b/src/gui/qgsmaptoolpan.cpp	2015-12-30 15:55:02.679840978 +0100
@@ -39,6 +39,7 @@
     mDragging = true;
     // move map and other canvas items
     mCanvas->panAction( e );
+    mCanvas->refresh();
   }
 }