Index: src/org/openstreetmap/josm/gui/mappaint/MapPaintStyles.java
===================================================================
--- src/org/openstreetmap/josm/gui/mappaint/MapPaintStyles.java	(revision 16509)
+++ src/org/openstreetmap/josm/gui/mappaint/MapPaintStyles.java	(working copy)
@@ -56,6 +56,11 @@
                 mapPaintStylesUpdated();
             }
         });
+        Config.getPref().addPreferenceChangeListener(e -> {
+            if (e.getKey().contains("mappaint")) {
+                MapPaintStyles.readFromPreferences();
+            }
+        });
     }
 
     private static ElemStyles styles = new ElemStyles();
Index: src/org/openstreetmap/josm/gui/preferences/display/ColorPreference.java
===================================================================
--- src/org/openstreetmap/josm/gui/preferences/display/ColorPreference.java	(revision 16509)
+++ src/org/openstreetmap/josm/gui/preferences/display/ColorPreference.java	(working copy)
@@ -390,18 +390,16 @@
 
     @Override
     public boolean ok() {
-        boolean ret = false;
         for (ColorEntry d : tableModel.getDeleted()) {
             d.toProperty().remove();
         }
         for (ColorEntry e : tableModel.getData()) {
-            if (e.info.getValue() != null && e.toProperty().put(e.info.getValue())
-                    && NamedColorProperty.COLOR_CATEGORY_MAPPAINT.equals(e.info.getCategory())) {
-                ret = true;
+            if (e.info.getValue() != null) {
+                e.toProperty().put(e.info.getValue());
             }
         }
         OsmDataLayer.createHatchTexture();
-        return ret;
+        return false;
     }
 
     @Override