Can´t see any files via WD Photos (iPad) or other dlna apps

I recently installed my WD My book live duo and moved about 180GB of pictures, movies and music. When trying to access the NAS via WD Photos i can see the device and connect to it but receives a 404 17.26 error. Has tried to reboot, remove/add mobile device, empty the cash in the app, recreated the WD 2go server etc but nothing helps. If I tries to access the NAS via an other dlna app i can only see some of the files - all the folders are there but not the files. So my question, can the reason bee that the WS My Book… needs som hours to build up some media library or so? 

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