WD TV Live UPnP DLNA access to Fritzbox 7390

Hi, I have the following problem: I cannot see the UPnP DLNA server of my Fritzbox 7390 from the music/video menu in my WD TV Live. Both the WD TV Live and the Fritzbox 7390 have the newest firmware version installed. I know that the Fritzbox UPnP DLNA server is working, because I can see and access it from my PC with Videolan Client and also from a simple internetradio. I can also access the UPnP DLNA server of my phone from the WD TV Live. Only the connection between WD TV Live and Fritzbox is not working. Do you have any ideas to get it working? Best regards