Trouble with Plex for Opera TV Store

Hi, I recently purchased a HiSense Smart TV and downloaded Plex from the Opera TV Store. The app mostly works fine but when you try to play a movie or TV show it gets stuck on a black screen. If you press fast forward the app freezes. Anyone know how to fix this? Thanks

Your problem could be happening due to a bunch of reasons. If you try to play the same content via the plex.tv in a Chrome browser, does it work?