Index: trunk/src/org/openstreetmap/josm/data/Preferences.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/Preferences.java	(revision 3547)
+++ trunk/src/org/openstreetmap/josm/data/Preferences.java	(revision 3548)
@@ -650,5 +650,4 @@
               changed |= put(k, null);
             } catch(NumberFormatException e) {
-                System.err.println("Warning: invalid preference.");
                 e.printStackTrace();
             }