Your MediaServer: Fritzbox(Router) with external harddrive, so I think its DLNA?
My problem is that its not possible to pause mkv files with this application. I can start them and they´re runnin perfectly but if I push the "pause" button, the movie stops, screens black and when hit "play" again, the movie starts new at the beginning. Also its not possible to skip the moviefile to specific time. I also have some mp4 files on my hard drive and there are no problems with them.
My second problem is that its not possible for me to find suitable Information with pics etc from series like "GoT", "True Detective","House of cards" and so on.
I hope you can help me