I installed Plex Media Server without too much difficulty. However, when I first launched it from the DL4100 dashboard, it told me an update was available. I downloaded it but could not install it. No application to install a *.bin file. So I gave up without fooling around with it. My presumption is that it will update automatically on the DL4100. Does anyone know?
Establishing settings was pretty easy. Mostly I just went with the apparent default settings. I had the most difficulty pointing the application to my video files. It took me about 15 minutes of fiddling around on the Plex dashboard before I stumbled on the "add library" button. From that point it was pretty automatic as the application quickly discovered and loaded all my movies and home videos.
At this point I'm mostly interested in streaming movies to several TVs in my house on my CAT6 network. I went to a TV and started DLNA and there it was, "PlexMediaServeronWDMyCloudDL4100." And there were all my movies. Although I have categorized them in folders on the DL4100, Plex also categorized them. I can access my categorization by going to "folders." Or I can use the Plex categorization.
Plex does not seem to have the fussiness regarding video codecs that started my little adventure.
Will update as I discover warts or good things.