Hi,
DuneX2Mede8er it is not a scraping tool: movie info are taken from the XML library of DuneX. You still have a chance to override some of those info with data gathered from TheMovieDb data. Sorry, but you cannot change the DB source.
If you can't see movie in DX2M8 that means that no info is present in the original (DuneX) library. You can easily check within DuneX what info/posters are displayed when you scan your library.