Plex media player won't play files

I have plex server installed on my computer. I also have plex media player installed on the same computer because it is my HTPC. I used to be able to watch videos on plex media player, but after the latest update it won’t play them anymore. It says “no audio or video data played”. This is on the same computer that the server is on, and the server plays things fine. Why won’t the media player play anything? All other apps work fine (from my Xbox, or tablet). Please help

Hello, since the issue is only with PMP, you should take a look in the PMP forum. Here is a thread which looks similar.
https://forums.plex.tv/discussion/264548/there-was-a-problem-playing-this-item-no-audio-or-video-data-played#latest