DarqUI uses the same EQ2MAP files as the official updater. Prior to last month's utility update, POIs from the \Default folder were synced with the custom UI folder each time you opened the utility. For players who also use EQ2MAP, this would result in duplicate icons on the map for default locations. You would get two icons for each travel bell, zone line, etc.
Version 188.8.131.52 no longer syncs the default POI files (eq2_poi.xml and eq2_poi_links.xml) if it detects that you also have EQ2MAP installed. To revert to the old behavior you can uncheck the box for "Copy default POI files into the custom UI folder unless EQ2MAP is installed" on the Settings page of the utility. Otherwise, map updates are succeeding again after the short downtime last month.