Index: trunk/src/org/openstreetmap/josm/data/cache/JCSCachedTileLoaderJob.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/cache/JCSCachedTileLoaderJob.java	(revision 11956)
+++ trunk/src/org/openstreetmap/josm/data/cache/JCSCachedTileLoaderJob.java	(revision 11958)
@@ -318,4 +318,5 @@
             }
 
+            LOG.log(Level.FINE, "JCS - starting HttpClient GET request for URL: {0}", getUrl());
             final HttpClient request = getRequest("GET", true);
 
Index: trunk/src/org/openstreetmap/josm/gui/layer/AbstractTileSourceLayer.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/layer/AbstractTileSourceLayer.java	(revision 11956)
+++ trunk/src/org/openstreetmap/josm/gui/layer/AbstractTileSourceLayer.java	(revision 11958)
@@ -88,5 +88,4 @@
 import org.openstreetmap.josm.data.projection.Projections;
 import org.openstreetmap.josm.gui.ExtendedDialog;
-import org.openstreetmap.josm.gui.MapFrame;
 import org.openstreetmap.josm.gui.MapView;
 import org.openstreetmap.josm.gui.NavigatableComponent.ZoomChangeListener;
@@ -1852,3 +1851,11 @@
         }
     }
+
+    @Override
+    public void projectionChanged(Projection oldValue, Projection newValue) {
+        super.projectionChanged(oldValue, newValue);
+        if (tileCache != null) {
+            tileCache.clear();
+        }
+    }
 }