Index: trunk/src/org/openstreetmap/josm/gui/layer/markerlayer/ImageMarker.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/layer/markerlayer/ImageMarker.java	(revision 18631)
+++ trunk/src/org/openstreetmap/josm/gui/layer/markerlayer/ImageMarker.java	(revision 18634)
@@ -5,4 +5,5 @@
 
 import java.awt.event.ActionEvent;
+import java.io.UncheckedIOException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -67,5 +68,9 @@
         } catch (URISyntaxException e) {
             Logging.trace(e);
-            new Notification(tr("Malformed URI: ", this.imageUrl.toExternalForm())).setIcon(JOptionPane.WARNING_MESSAGE).show();
+            new Notification(tr("Malformed URI: {0}", this.imageUrl.toExternalForm())).setIcon(JOptionPane.WARNING_MESSAGE).show();
+        } catch (UncheckedIOException e) {
+            Logging.trace(e);
+            new Notification(tr("IO Exception: {0}\n{1}", this.imageUrl.toExternalForm(), e.getCause().getMessage()))
+                    .setIcon(JOptionPane.WARNING_MESSAGE).show();
         }
         return null;