That these tv web browsers are no where near the capability of a PC. You need to report this to Samsung as well as the web master at rt.com and ask them if they support Smart TVs.
I noticed recently the web browser on my Samsung Plasma stopped playing audio for certain streaming videos. For instance, I used to be able to get video and audio from this site: http://rt.com/on-air/ But now all I get is the video, and no audio. I'm wondering if this has something to do with my version of Adobe Flash Player on the TV. If anyone has experienced a similar issue, please respond.