Index: src/org/openstreetmap/josm/gui/MapView.java
===================================================================
--- src/org/openstreetmap/josm/gui/MapView.java	(revision 10895)
+++ src/org/openstreetmap/josm/gui/MapView.java	(working copy)
@@ -1277,6 +1277,7 @@
             temporaryLayers.clear();
         }
         nonChangedLayersBuffer = null;
+        offscreenBuffer = null;
     }
 
     /**