Youtube embedding not working post 4.0.1 upgrade

[Jordano]

Upgraded to 4.0.1 and since then the youtube embedding has stopped working, I even copied the embed code of a working video (which still displays in the topic) into a new topic and it just pastes the code

 

<iframe width="560" height="315" src="https://www.youtube.com/embed/VeNCpTjuGuc" frameborder="0" allowfullscreen></iframe> - thats the code, doesn't work post updgrade