playing videos

Hi, I am having trouble playing videos off the site these last few days. I get a green and purple strip that runs across the screen and the video itself also becomes shaky. I have been able to find the videos on YouTube and watch them that way, but I am a FB plus member so some of the videos are not on YouTube. I am using the same computer so I don't know why my YouTube videos are fine but when i am on the FB the videos are disruptive. Any help would be appreciated thank you.