Index: trunk/src/org/openstreetmap/josm/gui/mappaint/MapPaintStyles.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/mappaint/MapPaintStyles.java	(revision 8936)
+++ trunk/src/org/openstreetmap/josm/gui/mappaint/MapPaintStyles.java	(revision 8937)
@@ -11,4 +11,5 @@
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.LinkedList;
@@ -266,7 +267,12 @@
             }
         }
-        if (Main.isDebugEnabled()) {
+        if (Main.isDebugEnabled() || !source.getErrors().isEmpty()) {
             final long elapsedTime = System.currentTimeMillis() - startTime;
-            Main.debug("Initializing map style " + source.url + " completed in " + Utils.getDurationString(elapsedTime));
+            String message = "Initializing map style " + source.url + " completed in " + Utils.getDurationString(elapsedTime);
+            if (!source.getErrors().isEmpty()) {
+                Main.warn(message + " (" + source.getErrors().size() + " errors)");
+            } else {
+                Main.debug(message);
+            }
         }
     }
@@ -433,5 +439,10 @@
     }
 
-    public static void addStyle(SourceEntry entry) {
+    /**
+     * Add a new map paint style.
+     * @param entry map paint style
+     * @return list of errors that occured during loading
+     */
+    public static Collection<Throwable> addStyle(SourceEntry entry) {
         StyleSource source = fromSourceEntry(entry);
         if (source != null) {
@@ -441,6 +452,10 @@
             fireMapPaintSylesUpdated();
             styles.clearCached();
-            Main.map.mapView.repaint();
-        }
+            if (Main.isDisplayingMapView()) {
+                Main.map.mapView.repaint();
+            }
+            return source.getErrors();
+        }
+        return Collections.emptyList();
     }
 
Index: trunk/src/org/openstreetmap/josm/gui/tagging/presets/TaggingPreset.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/tagging/presets/TaggingPreset.java	(revision 8936)
+++ trunk/src/org/openstreetmap/josm/gui/tagging/presets/TaggingPreset.java	(revision 8937)
@@ -83,4 +83,7 @@
     public static final String OPTIONAL_TOOLTIP_TEXT = "Optional tooltip text";
 
+    /** Prefix of preset icon loading failure error message */
+    public static final String PRESET_ICON_ERROR_MSG_PREFIX = "Could not get presets icon ";
+
     public TaggingPresetMenu group;
     public String name;
@@ -166,4 +169,5 @@
      * Called from the XML parser to set the icon.
      * The loading task is performed in the background in order to speedup startup.
+     * @param iconName icon name
      */
     public void setIcon(final String iconName) {
@@ -190,5 +194,5 @@
                     });
                 } else {
-                    Main.warn("Could not get presets icon " + iconName);
+                    Main.warn(PRESET_ICON_ERROR_MSG_PREFIX + iconName);
                 }
             }