Chromcast connection

I hope that I am not the only one with this issue. That would mean it is most likely not me causing the problem. but for the last two to three days I have been unable to get my videos to play through my chromcast on my tv. It will only display the YouTube screen. I hit play and it just stays there. I got spoiled with my workouts being on a big screen and find it challenging to do on my little phone. Videos play from the youtube site and from my yoga app so I winder if it is something with the site. Is there any suggestions or help anyone could give me? We have two chromcast in our house and it is the same for both of them.