I’m having the same problems. No files showing under DNLA scan and nothing on the Twonky settings page. Just out of interest, how many media files do you have? I received the message ‘Exceeded share directory monitor resource limit’ and belive this may be causing a problem. See this thread;
http://community.wd.com/t5/WD-My-Cloud/Exceeded-share-directory-monitor-resource-limit/td-p/604825
I did manage to get it to work for a bit after turning media serving off for all shares, but leaving media server on. I could then access Twonky ok, so I put media serving back on my pictures share and it picked up all my photos fine (20,000). I could stream to my TV, iPad, phone etc. I then put media serving back on my music share, but it froze while scanning 22,000 mp3s, so I had to pull the power on the My Cloud. Now I’m back at square one…