Thread:Project:Support desk/API always returns empty result set/reply (3)

MWDumper doesn't update secondary tables, including the search tables (if using builtin search). Try running rebuildtextindex.php. If you notice category pages also don't work, you could try running rebuildall.php which does everything rebuildtextindex.php does, but also rebuilds link tables (Note these scripts will take a long time on medium to big sized wikis).