Avia not loading with iframe code

Hello

I have embedded some simple youtube iframe code into the website… but after i saved the page and i then edit the page, i notice that the avia layout builder keeps turning around without loading any of the page layout which is really frustrating. How can this problem be fixed? If i remove the iframe code by reverting the page back to another version, then the avia page layout builder will load…

I do not want to embed the youtube video into the page other than inserting the iframe code as i need the ?rel=0 at the end of the code to stop the related videos displaying at the end.

I look forward to a clear and concise answer.

Thanks

R