I have been using Plex for 3+ years with my Roku Classic. In that time, I have been able to use the Plex It! bookmarklet to add most YouTube videos to my Queue, which I then watch on my TV via the Roku. However, in the last month or so, any YouTube videos I try to watch result in an "Unsupported Content" message when I try to play them on the Roku. I am able to watch them on my desktop computer (iMac).
Has anyone else had a similar problem? Thanks for any help/suggestions!