Donna said:
You would need to be on v5 which has iframely bypassed for youtube. 

 
I have that. V5.3.3

I just tested this video https://www.youtube.com/watch?v=HagVnWAeGcM and it worked for me. Please ensure you are using default SE version 5.3.3.

I started with se PHP 5. I was able to upgrade to 5.3.3 on the private development server just to see if it had negative effects on our modifications. But when we tried to upgrade the live server we had an upload limit. the server is AWS, and we have s3...  moreI started with se PHP 5. I was able to upgrade to 5.3.3 on the private development server just to see if it had negative effects on our modifications. But when we tried to upgrade the live server we had an upload limit. the server is AWS, and we have s3 set up. Do you have any idea what has happened?