Index: trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/ComboMultiSelect.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/ComboMultiSelect.java	(revision 9038)
+++ trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/ComboMultiSelect.java	(revision 9044)
@@ -403,4 +403,5 @@
             Main.error(tr("Broken tagging preset \"{0}-{1}\" - number of items in ''display_values'' must be the same as in ''values''",
                             key, text));
+            Main.error(tr("Detailed information: {0} <> {1}", Arrays.toString(display_array), Arrays.toString(value_array)));
             display_array = value_array;
         }
@@ -409,4 +410,5 @@
             Main.error(tr("Broken tagging preset \"{0}-{1}\" - number of items in ''short_descriptions'' must be the same as in ''values''",
                             key, text));
+            Main.error(tr("Detailed information: {0} <> {1}", Arrays.toString(short_descriptions_array), Arrays.toString(value_array)));
             short_descriptions_array = null;
         }