I am loving plex, it is a top notch piece of software. Unfortunately I have audio issues with my samsung tv like many other users so I dusted off my rasberry pi and installed rasplex.
I think the combination of my old onkyo receiver and my samsung tv are causing issues, when i play any video in rasplex the tv switches to the input 'HDMI-CEC XBMC' automagically which is a blank screen. I dont think I can disable HDMI-CEC on the samsung TV so it is possible in rasplex? I cant see any obvious option but maybe i can disable it in a config file somewhere?
You should be able to disable it on the tv. Samsung calls it Anynet. On my 2010 tv, its under: Menu>Anynet>Setup. I can also start with the tools button on the remote to get to the same place.