Yup. Now I am getting this dreaded message which, after searching, it appears there is no solution to. Just simple .avi files that used to play on Plex but, now I have a huge folder that is DOA for all intents. This seems like a whopping step backwards to me. Of course, this happens while I am showing off the coolness factor to some family members. In the living room, 10 people, I go to Roku and then open Plex and then to a folder of .avi files. "Watch this!" I say as it tries to play the file....waiting.....waiting....waiting......then the error message.
I had a nice red face for all.
OSX Mountain Lion 10.8.4 2.8GHZ Core 2 Duo